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Claude Fable 5 vs Claude Opus 4.1
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| Attribute | Claude Fable 5 | Claude Opus 4.1 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 162 | 144 |
| Coding | 99 | 30 |
| Math | 95 | 17 |
| Reasoning & Knowledge | 96 | 29 |
| Agentic & Tools | 98 | 20 |
| Specifications | ||
| Developer | Anthropic | Anthropic |
| Family | Claude | Claude |
| Released | Jun 9, 2026 | Aug 5, 2025 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 200K |
| Price — $/M input | $10.00 | $15.00 |
| Price — $/M output | $50.00 | $75.00 |
| Inputs | text, image, file | image, text, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 69% |
| APEX | 45% | — |
| GPQA Diamond | 93% | 77% |
| Humanity's Last Exam | 53% | 12% |
| SciCode | 60% | — |
| SimpleBench | 82% | 60% |
| SimpleQA Verified | 68% | 35% |
| WebDev Arena | 1654 | 1386 |
| WeirdML | 92% | 43% |
| τ²-bench | 99% | — |
| FrontierMath | — | 7% |
| FrontierMath Tier 4 | — | 4% |
| GDPval (win/tie rate) | — | 48% |
| METR task horizon | — | 1.9 h |
| SWE-bench Verified | — | 73% |
| Terminal-Bench | — | 38% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.