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Claude Sonnet 5.5 vs GPT-6 Astra
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| Attribute | Claude Sonnet 5.5 | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 169 |
| Coding | 96 | 93 |
| Math | 91 | 91 |
| Reasoning & Knowledge | 76 | 99 |
| Agentic & Tools | 100 | 90 |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Sep 28, 2026 | Sep 3, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $2.00 | $10.00 |
| Price — $/M output | $10.00 | $50.00 |
| Inputs | text, image, file | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 100% |
| APEX | 76% | 65% |
| GPQA Diamond | 96% | 96% |
| SimpleQA Verified | 47% | 76% |
| WebDev Arena | 1699 | 1800 |
| ARC-AGI | — | 99% |
| ARC-AGI-2 | — | 95% |
| Humanity's Last Exam | — | 55% |
| SciCode | — | 56% |
| WeirdML | — | 94% |
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.