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Claude Fable 5 vs GPT-5.6 Sol
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| Attribute | Claude Fable 5 | GPT-5.6 Sol |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 162 |
| Coding | 91 | 85 |
| Math | 91 | 91 |
| Reasoning & Knowledge | 86 | 89 |
| Agentic & Tools | 92 | 52 |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Jun 9, 2026 | Jul 9, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $10.00 | $4.00 |
| Price — $/M output | $50.00 | $20.00 |
| Inputs | text, image, file | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 100% |
| APEX | 64% | 51% |
| ARC-AGI | 99% | 98% |
| ARC-AGI-2 | 89% | 93% |
| GPQA Diamond | 86% | 93% |
| GSO (code optimization) | 78% | 76% |
| Humanity's Last Exam | 56% | 50% |
| SciCode | 61% | 57% |
| SimpleBench | 82% | 72% |
| SimpleQA Verified | 71% | 70% |
| WebDev Arena | 1628 | 1617 |
| WeirdML | 92% | 89% |
| τ²-bench | 99% | 85% |
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.