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Claude Fable 5.1 vs GPT-6 Astra
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| Attribute | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 169 |
| Coding | 100 | 95 |
| Math | 96 | 96 |
| Reasoning & Knowledge | 94 | 99 |
| Agentic & Tools | 98 | 96 |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Sep 1, 2026 | Sep 3, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $10.00 | $10.00 |
| Price — $/M output | $50.00 | $50.00 |
| Inputs | text, image, file | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 100% |
| APEX | 47% | 47% |
| ARC-AGI | 98% | 99% |
| ARC-AGI-2 | 90% | 95% |
| GPQA Diamond | 94% | 96% |
| Humanity's Last Exam | 47% | 55% |
| SciCode | 63% | 56% |
| SimpleQA Verified | 71% | 76% |
| WebDev Arena | 1765 | 1797 |
| WeirdML | 93% | 93% |
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.