Model comparison
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Differences vs. claude-opus-5 · max
Score, cost & time differences
Current baseline · claude-opus-5 · max
95Knowledge & Reasoning
Compared with claude-opus-5 · max
- claude-fable-5-1 · max
Knowledge & Reasoning: tiedReference cost $6.70 ($5.04 more)Evaluation time 9m 12s (31m 12s less)
Differences reflect these evaluation tasks. Cost and time cover the same dimension, not a typical conversation. Scoring & cost notes
| Metric | claude-opus-5 · max | claude-fable-5-1 · max |
|---|---|---|
| Knowledge & Reasoning | claude-opus-5max 95 | claude-fable-5-1max 95Tied |
| Overall | claude-opus-5max 81.70 | claude-fable-5-1max 87.25+5.55 pts |
| Backend engineering | claude-opus-5max 70 | claude-fable-5-1max 85+15 pts |
| Frontend interaction | claude-opus-5max 87 | claude-fable-5-1max 91+4 pts |
| Visual aesthetics | claude-opus-5max 73 | claude-fable-5-1max 80+7 pts |
| Maintainability | claude-opus-5max 61 | claude-fable-5-1max 68+7 pts |
Knowledge & Reasoning evaluation · Evaluation consumption, not a monthly subscription fee
Cost & time
Knowledge & Reasoning evaluation| Metric | claude-opus-5 · max | claude-fable-5-1 · max |
|---|---|---|
| Reference cost | claude-opus-5max $1.66 | claude-fable-5-1max $6.70+$5.04 |
| Evaluation time | claude-opus-5max 40m 24s | claude-fable-5-1max 9m 12s−77.2% |
Capability profiles
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Behind each score
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Backend engineeringSubscores
| Scoring dimension | claude-opus-5max | claude-fable-5-1max |
|---|---|---|
| Contracts and boundaries | 11 / 20 | 13 / 20 |
| Retries and failures | 15 / 20 | 20 / 20 |
| CI and adversarial review | 14 / 20 | 14 / 20 |
| Transactions and consistency | 15 / 20 | 19 / 20 |
| Caching and regression | 15 / 20 | 19 / 20 |
Frontend interactionSubscores
| Scoring dimension | claude-opus-5max | claude-fable-5-1max |
|---|---|---|
| Layout and adaptation | 20 / 20 | 20 / 20 |
| Interaction behavior | 20 / 20 | 20 / 20 |
| State continuity | 20 / 20 | 15 / 20 |
| Accessibility and feedback | 12 / 15 | 13 / 15 |
| State validation and regression | 15 / 25 | 23 / 25 |
Knowledge & ReasoningSubscores
| Scoring dimension | claude-opus-5max | claude-fable-5-1max |
|---|---|---|
| Mathematical reasoning | 15 / 15 | 15 / 15 |
| Computer science & AI | 10 / 15 | 10 / 15 |
| Science and engineering | 10 / 10 | 10 / 10 |
| Life sciences and medicine | 20 / 20 | 20 / 20 |
| Humanities and general knowledge | 40 / 40 | 40 / 40 |
Visual aestheticsSubscores
| Scoring dimension | claude-opus-5max | claude-fable-5-1max |
|---|---|---|
| Composition | 18 / 20 | 20 / 20 |
| Spacing and alignment | 18 / 20 | 18 / 20 |
| Typography and expression | 18 / 20 | 19 / 20 |
| Color and surfaces | 19 / 20 | 19 / 20 |
| Control styling | 17 / 20 | 17 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.
MaintainabilitySubscores
| Scoring dimension | claude-opus-5max | claude-fable-5-1max |
|---|---|---|
| Semantic clarity | 15 / 20 | 16 / 20 |
| Control-flow organization | 20 / 20 | 20 / 20 |
| Locality of changes | 16 / 20 | 15 / 20 |
| State and lifecycle | 18 / 20 | 18 / 20 |
| Implementation economy | 16 / 20 | 19 / 20 |
Subscores retain their original scale; the axis score uses a consistent conversion.