Model under test
Claude Opus 5
Every result this site holds for Claude Opus 5. We tested it inside Claude Code.
Version string recorded, as returned: claude-opus-5. The answers carry the requested name back, with no dated snapshot behind it.
What was measured, and where
We ran 53 separate tests on this model, listed by test method below and never added together. How the test methods were compared.
Prompting tips, replayed in Claude Code
12 tests, tested in Claude Code, Single-turn replay.
- Could not measure 5 of 12
- No measured effect 4 of 12
- Helped 3 of 12
Skills, in Claude Code: First run, single attempt
8 tests, tested in Claude Code, First run, single attempt.
- No measured effect 6 of 8
- Could not measure 2 of 8
Skills, in Claude Code: Second run, every task twice
8 tests, tested in Claude Code, Second run, every task twice.
- No measured effect 7 of 8
- Could not measure 1 of 8
Skills, in Claude Code: Wider run, three ways
25 tests, tested in Claude Code, Wider run, three ways.
- No measured effect 21 of 25
- Could not measure 4 of 25
What these figures can be set beside
Every table on this page is one job, run one way, on one occasion. A model tested the other way is not on those tables and its figures are not set against these. We checked the two test methods against each other and they came out different, so they are reported side by side and never averaged.
- Measured on
- tested in Claude Code.
- Not directly comparable
- Gemini 3.1 Flash Lite; GPT-5 mini; GPT-5.4 mini were tested through the API, which this model did not run. No figure below is theirs and none of theirs is set against these.
- Not directly comparable
- GPT-5.4 mini; GPT-5.6 Luna; GPT-5.6 Terra; GPT-6 Luna; GPT-6 Sol were tested inside Codex, which this model did not run. No figure below is theirs and none of theirs is set against these.
The model measured on both, job by job
Claude Haiku 4.5 was tested through the API and inside Claude Code. Its readings are the only thing connecting them, and they are stated job by job, never combined into one figure. It is one of two models that connect a pair of test methods this way. Each connects its own pair, and no chain is drawn through them.
Show the readings, job by job (17 jobs)
- Accessibility audit Claude Haiku 4.5 scored 40.0% (26.3% to 53.7%) tested via API, First run, with and without the skill, and 45.5% (35.0% to 56.0%) tested in Claude Code, Second run, every task twice, and 46.1% (34.1% to 58.1%) tested in Claude Code, Wider run, three ways. They are stated side by side and are not differenced. How well the two paths agree here: 8 of 8 tests agree. What was compared.
- Code review Claude Haiku 4.5 scored 58.3% (47.8% to 68.7%) tested in Claude Code, Wider run, three ways. That is one test method only, so it bridges nothing on its own.
- On-page audit Claude Haiku 4.5 scored 23.9% (1.8% to 46.1%) tested via API, First run, with and without the skill, and 23.1% (6.6% to 39.6%) tested in Claude Code, Second run, every task twice, and 23.1% (3.6% to 42.6%) tested in Claude Code, Wider run, three ways. They are stated side by side and are not differenced. How well the two paths agree here: 8 of 8 tests agree. What was compared.
- Skill authoring Claude Haiku 4.5 scored 61.8% (52.3% to 71.3%) tested via API, First run, with and without the skill, and 70.0% (63.5% to 76.5%) tested in Claude Code, Second run, every task twice, and 67.3% (59.7% to 74.9%) tested in Claude Code, Wider run, three ways. They are stated side by side and are not differenced. How well the two paths agree here: 8 of 8 tests agree. What was compared.
- Spec writing Claude Haiku 4.5 scored 99.5% (98.7% to 100.0%†) tested via API, First run, with and without the skill, and 98.6% (97.7% to 99.6%) tested in Claude Code, Second run, every task twice, and 99.2% (98.7% to 99.7%) tested in Claude Code, Wider run, three ways. They are stated side by side and are not differenced. How well the two paths agree here: 8 of 8 tests agree. What was compared.
- Getting clean JSON back Claude Haiku 4.5 scored 0.0% (0.0% to 0.0%) tested via API, Main run, tip by tip, and 0.0% (0.0% to 0.0%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Instructions before or after Claude Haiku 4.5 scored 100.0% (100.0% to 100.0%) tested via API, Main run, tip by tip, and 100.0% (100.0% to 100.0%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Using tags and formatting Claude Haiku 4.5 scored 100.0% (100.0% to 100.0%) tested via API, Main run, tip by tip, and 100.0% (100.0% to 100.0%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Showing examples Claude Haiku 4.5 scored 100.0% (100.0% to 100.0%) tested in Claude Code. That is one test method only, so it bridges nothing on its own.
- Showing examples Claude Haiku 4.5 scored 81.4% (77.2% to 85.7%) tested via API, Main run, tip by tip, and 81.4% (77.2% to 85.7%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Showing examples Claude Haiku 4.5 scored 81.4% (77.2% to 85.7%) tested via API, Main run, tip by tip, and 81.4% (77.2% to 85.7%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Better step-by-step answers Claude Haiku 4.5 scored 30.0% (17.2% to 42.8%) tested via API, Main run, tip by tip, and 20.0% (8.8% to 31.2%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Stop made-up answers Claude Haiku 4.5 scored 0.0% (0.0% to 0.0%) tested via API, Main run, tip by tip, and 22.0% (10.4% to 33.6%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Instructions in long prompts Claude Haiku 4.5 scored 100.0% (100.0% to 100.0%) tested via API, Main run, tip by tip, and 100.0% (100.0% to 100.0%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Offering the model money Claude Haiku 4.5 scored 204 words (199 words to 209 words) tested via API, Main run, tip by tip, and 241 words (236 words to 247 words) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Questions about recent events Claude Haiku 4.5 scored 85.6% (73.2% to 98.0%) tested via API, Main run, tip by tip, and 96.7% (90.1% to 100.0%†) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
- Getting the length right Claude Haiku 4.5 scored 24.7% (1.2% to 48.2%) tested via API, Main run, tip by tip, and 27.5% (0.0% to 54.9%) tested in Claude Code. They are stated side by side and are not differenced. How well the two paths agree here: second test method, 1 of 2 tests. What was compared.
† The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
- The grader, separately
- a second test method, 92 of 120 picks, 10 of 12 tests. The grader itself, replayed on the committed judgements rather than on any subject. Both criteria we set in advance failed, and the graded classes stayed unrun on this path because of it.
What this model does on its own, one job at a time
We measured this model on 17 kinds of work, and the scores for every one of them are below.
Show the figures, one job at a time
One table per job and per test method, ranked by what the model did with no help. Nothing here is averaged across a job, a test method or a run. Every model’s tables sit together on the comparison page.
Of the 4 models measured on this work, Claude Opus 5 is the cheapest one whose score this test could not tell apart from the best score.
What one task costs with no help, and what it scores On-page audit
- tested via API
- tested in Claude Code
Across: what one task costs with no help, in US dollars at list price. Each gridline is ten times the one before it. Up: deterministic pass rate, 0 to 1.
- Gemini 3.1 Flash Lite First run, with and without the skill tested via API $0.00023 per task scored 48.8%, 27.1% to 70.5%
- Gemini 3.1 Flash Lite Wider run, three ways tested via API $0.00023 per task scored 48.8%, 27.1% to 70.5%
- GPT-5 mini First run, with and without the skill tested via API $0.00029 per task scored 44.9%, 26.7% to 63.1%
- GPT-5 mini Wider run, three ways tested via API $0.00029 per task scored 52.2%, 37.4% to 67.0%
- Claude Haiku 4.5 First run, with and without the skill tested via API $0.00085 per task scored 23.9%, 1.8% to 46.1%
- Claude Haiku 4.5 Wider run, three ways tested in Claude Code $0.00105 per task scored 23.1%, 3.6% to 42.6%
- Claude Sonnet 5 Wider run, three ways tested in Claude Code $0.00362 per task scored 53.0%, 43.8% to 62.2%
- Claude Opus 5 First run, single attempt tested in Claude Code $0.00710 per task scored 87.9%, 76.7% to 99.1%
- Claude Opus 5 Wider run, three ways tested in Claude Code $0.00715 per task scored 88.1%, 76.9% to 99.2%
- Claude Opus 5.5 Opus 5.5 series, wider run, three ways tested in Claude Code $0.01317 per task scored 93.3%, 86.1% to 100.0%† 15.3 s per call, middle half 14.4 s to 16.2 s
- Claude Fable 5 Fable 5, wider run, three ways tested in Claude Code $0.03795 per task scored 93.2%, 86.4% to 100.0%† 17.8 s per call, middle half 16.4 s to 19.0 s
- Claude Fable 5 First run, single attempt tested in Claude Code $0.03843 per task scored 92.3%, 85.3% to 99.4%
- Claude Fable 5.1 Wider run, three ways tested in Claude Code $0.03873 per task scored 97.2%, 93.5% to 100.0%†
- Claude Fable 5.1 Fable 5.1, single attempt tested in Claude Code $0.03907 per task scored 98.3%, 95.1% to 100.0%†
- † The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
- Marks here are all one size. Not every mark has a time behind it. Sizing only the ones that do would draw the rest at a size we did not measure. Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Measured, and not on this chart
- Claude Fable 5 Second run, every task twice tested in Claude Code This test did not report what a task cost on this model, so there is no place for it on the cost scale. It is left off rather than drawn at a guess. Why some figures are blank.
- Claude Haiku 4.5 Second run, every task twice tested in Claude Code This test did not report what a task cost on this model, so there is no place for it on the cost scale. It is left off rather than drawn at a guess. Why some figures are blank.
- Claude Opus 5 Second run, every task twice tested in Claude Code This test did not report what a task cost on this model, so there is no place for it on the cost scale. It is left off rather than drawn at a guess. Why some figures are blank.
- Claude Sonnet 5 Second run, every task twice tested in Claude Code This test did not report what a task cost on this model, so there is no place for it on the cost scale. It is left off rather than drawn at a guess. Why some figures are blank.
This is one of 17 sets of work this model was measured on. The same chart for every one of them sits on the comparison page, and the tables below carry this model’s figures for all of them.
Accessibility audit · seeded accessibility defects
tested in Claude Code, First run, single attempt
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Opus 5 | 89.0% 79.7% to 98.3% 20 records over 10 items, pooled from 2 entries | 87.0% rampstackco-accessibility-audit (of 2 entries) | $0.00696 run on subscription; shown at API list price for comparison | 946 in, 89 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Accessibility audit · seeded accessibility defects
tested in Claude Code, Second run, every task twice
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Opus 5 | 87.3% 78.3% to 96.4% 40 records over 10 items, pooled from 2 entries | 88.0% affaan-m-accessibility (of 2 entries) | $0.01384 run on subscription; shown at API list price for comparison | 1,892 in, 175 out | 0 a gate holding at zero, not a measured zero | 38 of 40 20.0 percentage points apart where not no sampling control here | not measured |
| 2 | Claude Sonnet 5 | 82.3% 73.9% to 90.7% 40 records over 10 items, pooled from 2 entries | 82.3% affaan-m-accessibility (of 2 entries) | $0.00745 run on subscription; shown at API list price for comparison | 2,544 in, 237 out | 0 a gate holding at zero, not a measured zero | 31 of 40 22.8 percentage points apart where not no sampling control here | not measured |
| 3 | Claude Haiku 4.5 | 45.5% 35.0% to 56.0% 40 records over 10 items, pooled from 2 entries | 69.0% rampstackco-accessibility-audit (of 2 entries) | $0.00206 run on subscription; shown at API list price for comparison | 1,530 in, 106 out | 0 a gate holding at zero, not a measured zero | 26 of 40 22.9 percentage points apart where not no sampling control here | not measured |
- Claude Fable 5: not published. 71 of 76 of the no-help calls in this job were answered by a different model (Claude Opus 5). We hold the figure back until those calls are bought again and answered by the model we asked for. The calls that went astray are not a random few. They land on the very runs this column averages, so a score built from the ones that came back correctly would describe which model the platform chose to send, not what this model can do. Why some figures are held back, under the rule that governs it.
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Accessibility audit · seeded accessibility defects
tested in Claude Code, Wider run, three ways
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 87.9% 76.3% to 99.5% 40 records over 10 items, pooled from 4 entries | 91.5% alirezarezvani-a11y-audit (of 4 entries) | $0.05126 run on subscription; shown at API list price for comparison | 949 in, 835 out | 755 | one pass, not measured | not measured |
| 2 | Claude Opus 5 | 87.1% 78.0% to 96.2% 40 records over 10 items, pooled from 4 entries | 91.5% affaan-m-accessibility (of 4 entries) | $0.00704 run on subscription; shown at API list price for comparison | 946 in, 92 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 3 | Claude Sonnet 5 | 80.2% 71.4% to 88.9% 40 records over 10 items, pooled from 4 entries | 80.7% alirezarezvani-a11y-audit (of 4 entries) | $0.00368 run on subscription; shown at API list price for comparison | 1,272 in, 114 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 4 | Claude Haiku 4.5 | 46.1% 34.1% to 58.1% 40 records over 10 items, pooled from 4 entries | 62.8% rampstackco-accessibility-audit (of 4 entries) | $0.00104 run on subscription; shown at API list price for comparison | 765 in, 56 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Code review · seeded code defects
tested in Claude Code, Wider run, three ways
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Opus 5 | 93.5% 84.7% to 100.0%† 80 records over 10 items, pooled from 8 entries | 95.5% addyosmani-code-review-and-quality (of 8 entries) | $0.00948 run on subscription; shown at API list price for comparison | 1,333 in, 113 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 2 | Claude Fable 5.1 | 89.0% 83.2% to 94.8% 80 records over 10 items, pooled from 8 entries | 93.5% tied: jeffallan-code-reviewer, mattpocock-code-review, open-gsd-code-review (of 8 entries) | $0.04548 run on subscription; shown at API list price for comparison | 1,349 in, 640 out | 555 | one pass, not measured | not measured |
| 3 | Claude Sonnet 5 | 74.9% 62.4% to 87.4% 80 records over 10 items, pooled from 8 entries | 83.3% rampstackco-code-review-web (of 8 entries) | $0.00406 run on subscription; shown at API list price for comparison | 1,659 in, 74 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 4 | Claude Haiku 4.5 | 58.3% 47.8% to 68.7% 80 records over 10 items, pooled from 8 entries | 56.7% open-gsd-code-review (of 8 entries) | $0.00120 run on subscription; shown at API list price for comparison | 998 in, 41 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
† The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
On-page audit · seeded on-page issues
tested in Claude Code, First run, single attempt
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 92.3% 85.3% to 99.4% 20 records over 10 items, pooled from 2 entries | 93.3% affaan-m-seo (of 2 entries) | $0.03843 run on subscription; shown at API list price for comparison | 1,068 in, 555 out | 483 | one pass, not measured | not measured |
| 2 | Claude Opus 5 | 87.9% 76.7% to 99.1% 20 records over 10 items, pooled from 2 entries | 83.3% rampstackco-seo-onpage (of 2 entries) | $0.00710 run on subscription; shown at API list price for comparison | 1,068 in, 71 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
On-page audit · seeded on-page issues
tested in Claude Code, Second run, every task twice
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Opus 5 | 88.5% 77.6% to 99.5% 40 records over 10 items, pooled from 2 entries | 83.3% rampstackco-seo-onpage (of 2 entries) | not measured | not measured in, 141 out | 0 a gate holding at zero, not a measured zero | 33 of 40 32.7 percentage points apart where not no sampling control here | not measured |
| 2 | Claude Fable 5 | 88.0% 79.2% to 96.9% 40 records over 10 items, pooled from 2 entries | 94.0% affaan-m-seo (of 2 entries) | not measured | not measured in, 1,203 out | 1,059 | 32 of 40 32.1 percentage points apart where not no sampling control here | not measured |
| 3 | Claude Sonnet 5 | 59.0% 46.0% to 72.0% 40 records over 10 items, pooled from 2 entries | 64.7% affaan-m-seo (of 2 entries) | not measured | not measured in, 171 out | 0 a gate holding at zero, not a measured zero | 29 of 40 26.6 percentage points apart where not no sampling control here | not measured |
| 4 | Claude Haiku 4.5 | 23.1% 6.6% to 39.6% 40 records over 10 items, pooled from 2 entries | 40.8% rampstackco-seo-onpage (of 2 entries) | not measured | not measured in, 83 out | 0 a gate holding at zero, not a measured zero | 32 of 40 36.2 percentage points apart where not no sampling control here | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
A cost per task needs both sides of the call. Only 0 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Only 0 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set. Why some figures are blank.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
On-page audit · seeded on-page issues
tested in Claude Code, Wider run, three ways
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 97.2% 93.5% to 100.0%† 30 records over 10 items, pooled from 3 entries | 98.3% rampstackco-seo-onpage (of 3 entries) | $0.03873 run on subscription; shown at API list price for comparison | 1,070 in, 561 out | 491 | one pass, not measured | not measured |
| 2 | Claude Opus 5 | 88.1% 76.9% to 99.2% 30 records over 10 items, pooled from 3 entries | 83.3% alirezarezvani-seo-audit (of 3 entries) | $0.00715 run on subscription; shown at API list price for comparison | 1,068 in, 72 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 3 | Claude Sonnet 5 | 53.0% 43.8% to 62.2% 30 records over 10 items, pooled from 3 entries | 66.5% affaan-m-seo (of 3 entries) | $0.00362 run on subscription; shown at API list price for comparison | 1,394 in, 84 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 4 | Claude Haiku 4.5 | 23.1% 3.6% to 42.6% 30 records over 10 items, pooled from 3 entries | 41.1% rampstackco-seo-onpage (of 3 entries) | $0.00105 run on subscription; shown at API list price for comparison | 832 in, 43 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
† The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Skill authoring · specification requirements
tested in Claude Code, First run, single attempt
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 20 records over 10 items, pooled from 2 entries | 100.0% anthropics-skill-creator (of 2 entries) | $0.10060 run on subscription; shown at API list price for comparison | 313 in, 1,949 out | 64 | one pass, not measured | not measured |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 20 records over 10 items, pooled from 2 entries | 100.0% tied: anthropics-skill-creator, rampstackco-skill-creation-walkthrough (of 2 entries) | $0.06061 run on subscription; shown at API list price for comparison | 313 in, 2,362 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Skill authoring · specification requirements
tested in Claude Code, Second run, every task twice
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 22 records over 10 items, pooled from 2 entries | 100.0% anthropics-skill-creator (of 2 entries) | $0.19551 run on subscription; shown at API list price for comparison | 628 in, 3,785 out | 131 | 19 of 21 72.7 percentage points apart where not 1 more answered once no sampling control here | not measured |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 30 records over 10 items, pooled from 2 entries | 100.0% rampstackco-skill-creation-walkthrough (of 2 entries) | $0.12485 run on subscription; shown at API list price for comparison | 627 in, 4,869 out | 0 a gate holding at zero, not a measured zero | 28 of 29 72.7 percentage points apart where not no sampling control here | not measured |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 40 records over 10 items, pooled from 2 entries | 92.7% anthropics-skill-creator (of 2 entries) | $0.03975 run on subscription; shown at API list price for comparison | 1,278 in, 3,719 out | 0 a gate holding at zero, not a measured zero | 35 of 40 72.7 percentage points apart where not no sampling control here | not measured |
| 2 | Claude Haiku 4.5 | 70.0% 63.5% to 76.5% 40 records over 10 items, pooled from 2 entries | 100.0% tied: anthropics-skill-creator, rampstackco-skill-creation-walkthrough (of 2 entries) | $0.00996 run on subscription; shown at API list price for comparison | 467 in, 1,898 out | 0 a gate holding at zero, not a measured zero | 29 of 40 36.4 percentage points apart where not no sampling control here | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Skill authoring · specification requirements
tested in Claude Code, Wider run, three ways
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 100.0% 100.0% to 100.0% 40 records over 10 items, pooled from 4 entries | 100.0% tied: openclaw-skill-creator, yusufkaraaslan-skill-builder (of 4 entries) | $0.16037 run on subscription; shown at API list price for comparison | 316 in, 3,144 out | 137 | one pass, not measured | not measured |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 40 records over 10 items, pooled from 4 entries | 100.0% tied: anthropics-skill-creator, openclaw-skill-creator, rampstackco-skill-creation-walkthrough, yusufkaraaslan-skill-builder (of 4 entries) | $0.05962 run on subscription; shown at API list price for comparison | 313 in, 2,322 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 40 records over 10 items, pooled from 4 entries | 100.0% tied: anthropics-skill-creator, openclaw-skill-creator, yusufkaraaslan-skill-builder (of 4 entries) | $0.02027 run on subscription; shown at API list price for comparison | 639 in, 1,899 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 2 | Claude Haiku 4.5 | 67.3% 59.7% to 74.9% 40 records over 10 items, pooled from 4 entries | 100.0% tied: anthropics-skill-creator, openclaw-skill-creator, rampstackco-skill-creation-walkthrough, yusufkaraaslan-skill-builder (of 4 entries) | $0.00504 run on subscription; shown at API list price for comparison | 233 in, 961 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Spec writing · required sections and acceptance criteria
tested in Claude Code, First run, single attempt
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 93.2% 91.2% to 95.2% 20 records over 10 items, pooled from 2 entries | 93.6% affaan-m-product-capability (of 2 entries) | $0.08369 run on subscription; shown at API list price for comparison | 386 in, 1,597 out | 20 | one pass, not measured | not measured |
| 2 | Claude Opus 5 | 92.3% 90.9% to 93.6% 20 records over 10 items, pooled from 2 entries | 93.6% rampstackco-pm-spec-writing (of 2 entries) | $0.05944 run on subscription; shown at API list price for comparison | 386 in, 2,300 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Spec writing · required sections and acceptance criteria
tested in Claude Code, Second run, every task twice
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Haiku 4.5 | 98.6% 97.7% to 99.6% 40 records over 10 items, pooled from 2 entries | 97.7% rampstackco-pm-spec-writing (of 2 entries) | not measured | not measured in, 1,145 out | 0 a gate holding at zero, not a measured zero | 26 of 40 9.1 percentage points apart where not no sampling control here | not measured |
| 2 | Claude Fable 5 | 95.7% 94.6% to 96.7% 40 records over 10 items, pooled from 2 entries | 92.7% tied: affaan-m-product-capability, rampstackco-pm-spec-writing (of 2 entries) | not measured | not measured in, 3,234 out | 38 | 25 of 40 9.1 percentage points apart where not no sampling control here | not measured |
| 3 | Claude Sonnet 5 | 94.8% 93.0% to 96.5% 40 records over 10 items, pooled from 2 entries | 95.0% rampstackco-pm-spec-writing (of 2 entries) | not measured | not measured in, 2,948 out | 0 a gate holding at zero, not a measured zero | 21 of 40 9.1 percentage points apart where not no sampling control here | not measured |
| 4 | Claude Opus 5 | 92.5% 91.3% to 93.7% 40 records over 10 items, pooled from 2 entries | 94.5% rampstackco-pm-spec-writing (of 2 entries) | not measured | not measured in, 5,009 out | 0 a gate holding at zero, not a measured zero | 27 of 40 9.8 percentage points apart where not no sampling control here | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
A cost per task needs both sides of the call. Only 26 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set.
A cost per task needs both sides of the call. Only 30 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set.
A cost per task needs both sides of the call. Only 32 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set.
A cost per task needs both sides of the call. Only 34 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Only 26 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set. Why some figures are blank.
Only 30 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set. Why some figures are blank.
Only 32 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set. Why some figures are blank.
Only 34 of the 40 runs behind this figure reported an input total, so there is no way to total it up. The figure is left blank rather than guessed from the runs that did report it: those runs are not a random half of the set. Why some figures are blank.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Spec writing · required sections and acceptance criteria
tested in Claude Code, Wider run, three ways
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Haiku 4.5 | 99.2% 98.7% to 99.7% 60 records over 10 items, pooled from 6 entries | 99.1% github-prd (of 6 entries) | $0.00315 run on subscription; shown at API list price for comparison | 283 in, 574 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 2 | Claude Fable 5.1 | 97.9% 96.8% to 99.0% 60 records over 10 items, pooled from 6 entries | 100.0% rampstackco-pm-spec-writing (of 6 entries) | $0.10719 run on subscription; shown at API list price for comparison | 388 in, 2,066 out | 110 | one pass, not measured | not measured |
| 3 | Claude Sonnet 5 | 96.2% 94.9% to 97.6% 60 records over 10 items, pooled from 6 entries | 97.3% github-prd (of 6 entries) | $0.01601 run on subscription; shown at API list price for comparison | 712 in, 1,459 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
| 4 | Claude Opus 5 | 92.3% 91.1% to 93.5% 60 records over 10 items, pooled from 6 entries | 94.5% phuryn-create-prd (of 6 entries) | $0.06098 run on subscription; shown at API list price for comparison | 386 in, 2,362 out | 0 a gate holding at zero, not a measured zero | one pass, not measured | not measured |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Getting clean JSON back
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 0.0% 0.0% to 0.0% 50 records | 100.0% C01-json-schema | $0.04321 run on subscription; shown at API list price for comparison | 1,496 in, 565 out | 46 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 0.0% 0.0% to 0.0% 50 records | 100.0% C01-json-schema | $0.04114 run on subscription; shown at API list price for comparison | 1,506 in, 522 out | 0 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Haiku 4.5 | 0.0% 0.0% to 0.0% 50 records | 100.0% C01-json-schema | $0.00316 run on subscription; shown at API list price for comparison | 1,102 in, 412 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 0.0% 0.0% to 0.0% 50 records | 100.0% C01-json-schema | $0.02287 run on subscription; shown at API list price for comparison | 1,496 in, 616 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 0.0% 0.0% to 0.0% 50 records | 100.0% C01-json-schema | $0.01160 run on subscription; shown at API list price for comparison | 3,126 in, 535 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Instructions before or after
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C02-instruction-after | $0.02645 run on subscription; shown at API list price for comparison | 2,465 in, 36 out | 0 | 20 of 20 every repeat agreed no sampling control here asked five times: withheld: 9 of 10 tasks got five usable answers | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 100.0% 100.0% to 100.0% 50 records | 100.0% C02-instruction-after | $0.02928 run on subscription; shown at API list price for comparison | 2,748 in, 36 out | 0 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Haiku 4.5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C02-instruction-after | $0.00201 run on subscription; shown at API list price for comparison | 1,806 in, 41 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C02-instruction-after | $0.01323 run on subscription; shown at API list price for comparison | 2,465 in, 36 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C02-instruction-after | $0.00855 run on subscription; shown at API list price for comparison | 4,095 in, 36 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Using tags and formatting
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 48 records | 100.0% C03-xml-delimiters | $0.11688 run on subscription; shown at API list price for comparison | 2,370 in, 1,864 out | 543 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 100.0% 100.0% to 100.0% 50 records | 100.0% C03-xml-delimiters | $0.17308 run on subscription; shown at API list price for comparison | 2,193 in, 3,023 out | 1,351 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Haiku 4.5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C03-xml-delimiters | $0.00533 run on subscription; shown at API list price for comparison | 1,574 in, 752 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C03-xml-delimiters | $0.04752 run on subscription; shown at API list price for comparison | 2,183 in, 1,464 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C03-xml-delimiters | $0.01651 run on subscription; shown at API list price for comparison | 3,813 in, 889 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Showing examples
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C04-three-shot-format | $0.03131 run on subscription; shown at API list price for comparison | 1,719 in, 283 out | 132 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 100.0% 100.0% to 100.0% 50 records | 100.0% C04-three-shot-format | $0.02474 run on subscription; shown at API list price for comparison | 1,729 in, 149 out | 0 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Haiku 4.5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C04-three-shot-format | $0.00187 run on subscription; shown at API list price for comparison | 1,281 in, 118 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C04-three-shot-format | $0.01238 run on subscription; shown at API list price for comparison | 1,719 in, 151 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C04-three-shot-format | $0.00822 run on subscription; shown at API list price for comparison | 3,349 in, 152 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Showing examples
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 82.3% 78.6% to 86.0% 10 items | 99.7% C04b-zero-vs-one | $0.08170 run on subscription; shown at API list price for comparison | 2,621 in, 1,110 out | 872 | 18 of 20 7.1 percentage points apart where not no sampling control here asked five times: 8 of 10 the same every time, 49 to 94 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 2 | Claude Fable 5.1 | 81.7% 77.7% to 85.7% 10 items | 100.0% C04b-zero-vs-one | $0.05013 run on subscription; shown at API list price for comparison | 2,590 in, 485 out | 252 | 19 of 20 5.7 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 3 | Claude Haiku 4.5 | 81.4% 77.2% to 85.7% 10 items | 94.3% C04b-zero-vs-one | $0.00311 run on subscription; shown at API list price for comparison | 1,961 in, 230 out | 0 a gate holding at zero, not a measured zero | 18 of 20 5.7 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 3 | Claude Opus 5 | 81.4% 77.2% to 85.7% 10 items | 98.0% C04b-zero-vs-one | $0.01882 run on subscription; shown at API list price for comparison | 2,578 in, 237 out | 0 a gate holding at zero, not a measured zero | 18 of 20 7.1 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 3 | Claude Sonnet 5 | 81.4% 77.2% to 85.7% 10 items | 97.7% C04b-zero-vs-one | $0.01142 run on subscription; shown at API list price for comparison | 4,534 in, 235 out | 0 a gate holding at zero, not a measured zero | 18 of 20 7.1 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Showing examples
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 82.0% 78.2% to 85.8% 10 items | 100.0% C04b-zero-vs-three | $0.07734 run on subscription; shown at API list price for comparison | 2,578 in, 1,031 out | 798 | 19 of 20 8.6 percentage points apart where not no sampling control here asked five times: withheld: 9 of 10 tasks got five usable answers | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 2 | Claude Sonnet 5 | 81.7% 77.7% to 85.7% 10 items | 100.0% C04b-zero-vs-three | $0.01142 run on subscription; shown at API list price for comparison | 4,534 in, 236 out | 0 a gate holding at zero, not a measured zero | 19 of 20 5.7 percentage points apart where not no sampling control here asked five times: 9 of 10 the same every time, 60 to 98 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 3 | Claude Fable 5.1 | 81.4% 77.2% to 85.7% 10 items | 100.0% C04b-zero-vs-three | $0.05010 run on subscription; shown at API list price for comparison | 2,590 in, 484 out | 252 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 3 | Claude Haiku 4.5 | 81.4% 77.2% to 85.7% 10 items | 98.9% C04b-zero-vs-three | $0.00310 run on subscription; shown at API list price for comparison | 1,961 in, 228 out | 0 a gate holding at zero, not a measured zero | 19 of 20 5.7 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 3 | Claude Opus 5 | 81.4% 77.2% to 85.7% 10 items | 99.7% C04b-zero-vs-three | $0.01882 run on subscription; shown at API list price for comparison | 2,578 in, 237 out | 0 a gate holding at zero, not a measured zero | 19 of 20 5.7 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Better step-by-step answers
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 40.0% 26.3% to 53.7% 50 records | 50.0% C05-think-step-by-step | $0.02052 run on subscription; shown at API list price for comparison | 1,444 in, 122 out | 107 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 40.0% 26.3% to 53.7% 50 records | 50.0% C05-think-step-by-step | $0.02103 run on subscription; shown at API list price for comparison | 1,454 in, 130 out | 0 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 40.0% 26.3% to 53.7% 50 records | 46.0% C05-think-step-by-step | $0.00807 run on subscription; shown at API list price for comparison | 1,444 in, 34 out | 0 a gate holding at zero, not a measured zero | 19 of 20 60.0 percentage points apart where not no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 40.0% 26.3% to 53.7% 50 records | 50.0% C05-think-step-by-step | $0.00630 run on subscription; shown at API list price for comparison | 3,074 in, 15 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 2 | Claude Haiku 4.5 | 20.0% 8.8% to 31.2% 50 records | 50.0% C05-think-step-by-step | $0.00135 run on subscription; shown at API list price for comparison | 1,098 in, 50 out | 0 a gate holding at zero, not a measured zero | 17 of 20 46.7 percentage points apart where not no sampling control here asked five times: 8 of 10 the same every time, 49 to 94 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Stop made-up answers
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5.1 | 76.0% 64.0% to 88.0% 50 records | 100.0% C06-permit-idk | $0.03175 run on subscription; shown at API list price for comparison | 1,450 in, 345 out | 0 | 17 of 20 46.7 percentage points apart where not no sampling control here asked five times: 6 of 10 the same every time, 31 to 83 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 2 | Claude Sonnet 5 | 38.0% 24.4% to 51.6% 50 records | 100.0% C06-permit-idk | $0.01083 run on subscription; shown at API list price for comparison | 3,070 in, 469 out | 0 a gate holding at zero, not a measured zero | 16 of 20 50.0 percentage points apart where not no sampling control here asked five times: 5 of 10 the same every time, 24 to 76 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 3 | Claude Opus 5 | 30.0% 17.2% to 42.8% 50 records | 100.0% C06-permit-idk | $0.02363 run on subscription; shown at API list price for comparison | 1,440 in, 657 out | 0 a gate holding at zero, not a measured zero | 15 of 20 40.0 percentage points apart where not no sampling control here asked five times: 8 of 10 the same every time, 49 to 94 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 4 | Claude Fable 5 | 24.0% 12.0% to 36.0% 50 records | 100.0% C06-permit-idk | $0.03501 run on subscription; shown at API list price for comparison | 1,440 in, 412 out | 44 | 14 of 20 46.7 percentage points apart where not no sampling control here asked five times: withheld: 9 of 10 tasks got five usable answers | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 5 | Claude Haiku 4.5 | 22.0% 10.4% to 33.6% 50 records | 100.0% C06-permit-idk | $0.00340 run on subscription; shown at API list price for comparison | 1,081 in, 463 out | 0 a gate holding at zero, not a measured zero | 16 of 20 60.0 percentage points apart where not no sampling control here asked five times: 9 of 10 the same every time, 60 to 98 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Instructions in long prompts
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 100.0% 100.0% to 100.0% 33 records | 100.0% C07-instruction-at-end | $0.23998 run on subscription; shown at API list price for comparison | 4,267 in, 3,946 out | 783 | 17 of 17 every repeat agreed no sampling control here asked five times: withheld: 8 of 10 tasks got five usable answers | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 1 | Claude Fable 5.1 | 100.0% 100.0% to 100.0% 50 records | 100.0% C07-instruction-at-end | $0.16619 run on subscription; shown at API list price for comparison | 6,464 in, 2,031 out | 362 | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 1 | Claude Haiku 4.5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C07-instruction-at-end | $0.00664 run on subscription; shown at API list price for comparison | 2,211 in, 885 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 1 | Claude Opus 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C07-instruction-at-end | $0.08287 run on subscription; shown at API list price for comparison | 3,170 in, 2,681 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 1 | Claude Sonnet 5 | 100.0% 100.0% to 100.0% 50 records | 100.0% C07-instruction-at-end | $0.02143 run on subscription; shown at API list price for comparison | 4,800 in, 1,183 out | 0 a gate holding at zero, not a measured zero | 20 of 20 every repeat agreed no sampling control here asked five times: 10 of 10 the same every time, 72 to 100 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Offering the model money
tested in Claude Code
| Rank | Model | Answer length, on its own | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Opus 5 | 544 words 509 to 579 50 answers | 828 words C08-tip-length | $0.15452 run on subscription; shown at API list price for comparison | 1,247 in, 5,931 out | 0 a gate holding at zero, not a measured zero | 0 of 20 112 words apart where not no sampling control here asked five times: 0 of 10 the same every time, 0 to 28 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
| 2 | Claude Fable 5.1 | 403 words 385 to 421 50 answers | 508 words C08-tip-length | $0.23338 run on subscription; shown at API list price for comparison | 1,257 in, 4,416 out | 3 | 0 of 20 58 words apart where not no sampling control here asked five times: 0 of 10 the same every time, 0 to 28 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 3 | Claude Sonnet 5 | 377 words 362 to 392 50 answers | 457 words C08-tip-length | $0.04774 run on subscription; shown at API list price for comparison | 2,877 in, 4,199 out | 0 a gate holding at zero, not a measured zero | 0 of 20 44 words apart where not no sampling control here asked five times: 0 of 10 the same every time, 0 to 28 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 4 | Claude Fable 5 | 325 words 313 to 336 50 answers | 387 words C08-tip-length | $0.20286 run on subscription; shown at API list price for comparison | 1,247 in, 3,808 out | 86 | 0 of 20 32 words apart where not no sampling control here asked five times: 0 of 10 the same every time, 0 to 28 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 5 | Claude Haiku 4.5 | 241 words 236 to 247 50 answers | 258 words C08-tip-length | $0.01031 run on subscription; shown at API list price for comparison | 928 in, 1,877 out | 0 a gate holding at zero, not a measured zero | 0 of 20 12 words apart where not no sampling control here asked five times: 0 of 10 the same every time, 0 to 28 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Questions about recent events
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Haiku 4.5 | 96.7% 90.1% to 100.0%† 30 items | 99.2% C16-cutoff-disclosure | $0.00220 run on subscription; shown at API list price for comparison | 474 in, 345 out | 0 a gate holding at zero, not a measured zero | 19 of 20 50.0 percentage points apart where not 40 more answered once no sampling control here asked five times: 28 of 30 the same every time, 79 to 98 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 2 | Claude Sonnet 5 | 93.3% 84.3% to 100.0%† 30 items | 92.5% C16-cutoff-disclosure | $0.00757 run on subscription; shown at API list price for comparison | 1,448 in, 467 out | 0 a gate holding at zero, not a measured zero | 19 of 20 50.0 percentage points apart where not 40 more answered once no sampling control here asked five times: 22 of 30 the same every time, 56 to 86 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 3 | Claude Fable 5.1 | 92.2% 83.0% to 100.0%† 30 items | 89.2% C16-cutoff-disclosure | $0.04170 run on subscription; shown at API list price for comparison | 638 in, 706 out | 347 | 18 of 20 58.3 percentage points apart where not 40 more answered once no sampling control here asked five times: 20 of 30 the same every time, 49 to 81 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 4 | Claude Fable 5 | 87.8% 77.5% to 98.0% 30 items | 95.6% C16-cutoff-disclosure | $0.04206 run on subscription; shown at API list price for comparison | 633 in, 715 out | 336 | 15 of 20 60.0 percentage points apart where not 40 more answered once no sampling control here asked five times: 20 of 30 the same every time, 49 to 81 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 5 | Claude Opus 5 | 80.3% 67.4% to 93.1% 30 items | 86.7% C16-cutoff-disclosure | $0.01566 run on subscription; shown at API list price for comparison | 633 in, 500 out | 0 a gate holding at zero, not a measured zero | 13 of 20 59.5 percentage points apart where not 40 more answered once no sampling control here asked five times: 23 of 30 the same every time, 59 to 88 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
† The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Getting the length right
tested in Claude Code
| Rank | Model | Unaided score | Best assisted score | Cost per task | Tokens per task | Thinking per task | Same answer on a repeat | Time per call |
|---|---|---|---|---|---|---|---|---|
| 1 | Claude Fable 5 | 76.0% 53.7% to 98.4% 10 items | 99.5% C17-exact-length | $0.16668 run on subscription; shown at API list price for comparison | 1,768 in, 2,980 out | 437 | 7 of 20 7.1 percentage points apart where not no sampling control here asked five times: 1 of 10 the same every time, 2 to 40 percent, no sampling control here | not measured asked five times: 15.0 s, middle half 13.2 s to 18.7 s over 729 calls on every tip |
| 2 | Claude Fable 5.1 | 50.2% 21.9% to 78.5% 10 items | 99.5% C17-exact-length | $0.22184 run on subscription; shown at API list price for comparison | 1,786 in, 4,080 out | 531 | 9 of 20 9.7 percentage points apart where not no sampling control here asked five times: 4 of 10 the same every time, 17 to 69 percent, no sampling control here | not measured asked five times: 13.0 s, middle half 11.3 s to 16.2 s over 700 calls on every tip |
| 3 | Claude Haiku 4.5 | 27.5% 0.0% to 54.9% 10 items | 92.5% C17-exact-length | $0.01432 run on subscription; shown at API list price for comparison | 1,319 in, 2,599 out | 0 a gate holding at zero, not a measured zero | 7 of 20 4.6 percentage points apart where not no sampling control here asked five times: 7 of 10 the same every time, 40 to 89 percent, no sampling control here | not measured asked five times: 11.4 s, middle half 10.5 s to 12.2 s over 700 calls on every tip |
| 4 | Claude Sonnet 5 | 17.8% 0.0% to 41.0%† 10 items | 95.2% C17-exact-length | $0.06459 run on subscription; shown at API list price for comparison | 4,050 in, 5,649 out | 0 a gate holding at zero, not a measured zero | 8 of 20 5.4 percentage points apart where not no sampling control here asked five times: 7 of 10 the same every time, 40 to 89 percent, no sampling control here | not measured asked five times: 11.8 s, middle half 10.8 s to 13.0 s over 700 calls on every tip |
| 5 | Claude Opus 5 | 15.0% 0.0% to 35.1%† 10 items | 97.3% C17-exact-length | $0.18907 run on subscription; shown at API list price for comparison | 1,768 in, 7,209 out | 0 a gate holding at zero, not a measured zero | 7 of 20 5.0 percentage points apart where not no sampling control here asked five times: 8 of 10 the same every time, 49 to 94 percent, no sampling control here | not measured asked five times: 12.0 s, middle half 11.0 s to 14.6 s over 700 calls on every tip |
This model ran at its own default settings. We could not fix them: one vendor will not accept a setting of 0, and Claude Code has no setting to fix. Recorded as a difference, not a failure.
† The bracket runs past the end of the scale. It is drawn to the end; the width beyond it is real and is what a small number of items buys.
Each answer here carries one time, the moment it was written down. There is no start and finish to measure a call between.
Assisted scores name the entry that produced them; skills and tips are ranked on their own pages, not here.
Opus 5.5 beside Fable 5.1, and after Opus 5
After Opus 5
Opus 5 was tested with its thinking switched off, and the switch held on every answer. Opus 5.5 cannot switch its thinking off. So this pair sets a model that did not think beside one that always does. It is the first pair like this we have published. No difference in it can be put down to either model.
Prompting tips: the two likely ranges overlap on 12 of 14 jobs.
Every job, with its figures
| Job | Claude Opus 5.5 | Claude Opus 5 | Overlap | Cost per task |
|---|---|---|---|---|
| Getting clean JSON back | +100.0 [+100.0, +100.0] | +100.0 [+100.0, +100.0] | yes | $0.0045 / $0.0044 |
| Instructions before or after | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0035 / $0.0026 |
| Using tags and formatting | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0123 / $0.0093 |
| Showing examples | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0033 / $0.0031 |
| Better step-by-step answers | +10.0 [-9.6, +29.6] | +0.0 [+0.0, +0.0] | yes | $0.0030 / $0.0028 |
| Stop made-up answers | +10.0 [-9.6, +29.6] | +50.0 [+17.3, +82.7] | yes | $0.0030 / $0.0032 |
| Instructions in long prompts | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0115 / $0.0163 |
| Offering the model money | +125.5 words [+61.5 words, +189.5 words] | +264.8 words [+150.3 words, +379.3 words] | yes | $0.0295 / $0.0381 |
| Showing examples | +17.1 [+13.4, +20.9] | +18.6 [+14.3, +22.8] | yes | $0.0052 / $0.0038 |
| Showing examples | +17.1 [+13.4, +20.9] | +15.7 [+12.9, +18.5] | yes | $0.0049 / $0.0034 |
| Getting the length right | +19.9 [+2.2, +37.5] | +81.1 [+58.8, +103.4] | no | $0.0215 / $0.0155 |
| Questions about recent events | -6.7 [-15.7, +2.4] | +6.7 [-9.4, +22.8] | yes | $0.0076 / $0.0056 |
| Getting clean JSON back, harder set | +100.0 [+100.0, +100.0] | +100.0 [+100.0, +100.0] | yes | $0.0071 / $0.0077 |
| Getting the length right, harder set | +99.8 [+99.3, +100.2] | +93.1 [+90.2, +95.9] | no | $0.0157 / $0.0111 |
Cost is what each side's own answers would have cost at the maker's list price. Nobody was charged it: every answer ran on a subscription.
Tips over several turns: the two likely ranges overlap on 2 of 3 jobs.
Every job, with its figures
| Job | Claude Opus 5.5 | Claude Opus 5 | Overlap | Cost per task |
|---|---|---|---|---|
| Rules for the whole chat | +0.0 [+0.0, +0.0] | -6.0 [-12.0, -0.01] | no | $0.2724 / $0.1232 |
| Splitting big tasks | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0084 / $0.0062 |
| Prompt, then revise | +1.4 [-1.4, +4.2] | +0.0 [+0.0, +0.0] | yes | $0.0137 / $0.0055 |
Cost is what each side's own answers would have cost at the maker's list price. Nobody was charged it: every answer ran on a subscription.
Skills: the two likely ranges overlap on 25 of 25 jobs.
Every job, with its figures
| Job | Claude Opus 5.5 | Claude Opus 5 | Overlap | Cost per task |
|---|---|---|---|---|
S07-seo-onpage | +4.2 [-4.7, +13.0] | -4.2 [-17.8, +9.4] | yes | $0.0461 / $0.0483 |
S08-ecc-seo | -3.3 [-9.9, +3.2] | -7.9 [-16.1, +0.4] | yes | $0.0188 / $0.0150 |
S20-alirezarezvani-seo-audit | +5.0 [-4.8, +14.8] | -3.3 [-14.3, +7.6] | yes | $0.0465 / $0.0481 |
S03-accessibility-audit | +0.0 [+0.0, +0.0] | -8.0 [-20.0, +4.0] | yes | $0.0881 / $0.0907 |
S04-ecc-accessibility | +2.1 [-5.1, +9.3] | +3.8 [-5.4, +13.0] | yes | $0.0266 / $0.0201 |
S14-wshobson-wcag-audit-patterns | -2.8 [-11.2, +5.7] | -6.7 [-21.4, +8.0] | yes | $0.0391 / $0.0335 |
S15-alirezarezvani-a11y-audit | -0.7 [-5.6, +4.1] | +0.8 [-7.8, +9.4] | yes | $0.1153 / $0.1275 |
S01-skill-creation-walkthrough | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.1230 / $0.1379 |
S02-skill-creator | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.1287 / $0.1509 |
S12-openclaw-skill-creator | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0470 / $0.0412 |
S13-yusufkaraaslan-skill-builder | +0.0 [+0.0, +0.0] | +0.0 [+0.0, +0.0] | yes | $0.0749 / $0.0756 |
S05-pm-spec-writing | +0.0 [+0.0, +0.0] | +2.7 [-1.9, +7.4] | yes | $0.0912 / $0.1039 |
S06-product-capability | +1.8 [-0.6, +4.2] | +1.8 [-1.7, +5.4] | yes | $0.0553 / $0.0745 |
S16-phuryn-create-prd | +0.9 [-0.9, +2.7] | +3.6 [+0.7, +6.5] | yes | $0.0529 / $0.0680 |
S17-alirezarezvani-spec-driven-workflow | -0.9 [-4.1, +2.3] | -0.9 [-4.1, +2.3] | yes | $0.1463 / $0.1704 |
S18-addyosmani-spec-driven-development | +0.9 [-2.3, +4.1] | +0.0 [+0.0, +0.0] | yes | $0.0649 / $0.0784 |
S19-github-prd | +1.8 [-0.6, +4.2] | +0.0 [+0.0, +0.0] | yes | $0.0584 / $0.0805 |
S11-code-review-web | +2.0 [-1.9, +5.9] | +0.0 [+0.0, +0.0] | yes | $0.0606 / $0.0680 |
S22-mattpocock-code-review | -3.7 [-8.5, +1.1] | +2.0 [-1.9, +5.9] | yes | $0.0233 / $0.0207 |
S23-alirezarezvani-pr-review-expert | +1.7 [-1.6, +4.9] | -1.7 [-4.9, +1.6] | yes | $0.0361 / $0.0373 |
S24-addyosmani-code-review-and-quality | -3.3 [-7.7, +1.0] | +2.0 [-1.9, +5.9] | yes | $0.0412 / $0.0442 |
S25-jeffallan-code-reviewer | -1.7 [-4.9, +1.6] | +2.0 [-1.9, +5.9] | yes | $0.0634 / $0.0701 |
S26-everyinc-ce-code-review | +3.3 [-3.2, +9.9] | +0.0 [+0.0, +0.0] | yes | $0.4647 / $0.5750 |
S27-wshobson-code-review-excellence | +0.0 [+0.0, +0.0] | +2.0 [-1.9, +5.9] | yes | $0.0343 / $0.0349 |
S28-open-gsd-code-review | +3.3 [-3.2, +9.9] | +0.0 [+0.0, +0.0] | yes | $0.0165 / $0.0147 |
Cost is what each side's own answers would have cost at the maker's list price. Nobody was charged it: every answer ran on a subscription.
Thinking was refused, and the refusal held on every call
This model was set up to run with thinking turned off, and any thinking at all on it was declared a failure that stops the run. Across every answer it gave, the count is zero throughout. That is the switch holding rather than a measured zero, and it is not comparable with a model that was allowed to think.
- Answers reporting a nonzero count
- 0 of 1,330
- Thinking tokens recorded
- 0
This model was also run through Claude Code, on a path that bills nothing. How it was called, and what that means for every cost figure on this page, is below.
Show the full breakdown, tested in Claude Code
How this model was called, tested in Claude Code
On the Claude Code CLI, on a subscription path with no API key and nothing billed. Every cost figure this path returns is a client-side estimate at list price and is recorded under that label and no other. What that means, and how it was calibrated.
These results are tested in Claude Code and are never averaged with any figure tested via API. Where this model was measured on both, the two are reported as two panels above.