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Claude Fable 5 vs gpt-oss-20b
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| Attribute | Claude Fable 5 | gpt-oss-20b |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 138 |
| Coding | 91 | 10 |
| Math | 91 | 4 |
| Reasoning & Knowledge | 86 | 6 |
| Agentic & Tools | 92 | 6 |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Jun 9, 2026 | Aug 5, 2025 |
| Parameters | — | 20.9B |
| Availability | API access | Open weights (unrestricted) |
| Context window | 1M | 131K |
| Price — $/M input | $10.00 | $0.02 |
| Price — $/M output | $50.00 | $0.09 |
| Inputs | text, image, file | text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 65% |
| APEX | 64% | — |
| ARC-AGI | 99% | — |
| ARC-AGI-2 | 89% | — |
| GPQA Diamond | 86% | 61% |
| GSO (code optimization) | 78% | — |
| Humanity's Last Exam | 56% | 5% |
| SciCode | 61% | 39% |
| SimpleBench | 82% | — |
| SimpleQA Verified | 71% | — |
| WebDev Arena | 1628 | — |
| WeirdML | 92% | 41% |
| τ²-bench | 99% | 50% |
| LiveCodeBench | — | 65% |
| MMLU-Pro | — | 72% |
| Terminal-Bench | — | 3% |
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.