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Claude Opus 4.5 vs GPT-6 Astra
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| Attribute | Claude Opus 4.5 | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 150 | 169 |
| Coding | 62 | 94 |
| Math | 28 | 95 |
| Reasoning & Knowledge | 55 | 99 |
| Agentic & Tools | 52 | 93 |
| Specifications | ||
| Developer | Anthropic | OpenAI |
| Family | Claude | GPT |
| Released | Nov 24, 2025 | Sep 3, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 200K | 1.1M |
| Price — $/M input | $5.00 | $10.00 |
| Price — $/M output | $25.00 | $50.00 |
| Inputs | file, image, text | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 86% | 100% |
| APEX | 21% | 65% |
| ARC-AGI | 80% | 99% |
| ARC-AGI-2 | 38% | 95% |
| FrontierMath | 21% | — |
| FrontierMath Tier 4 | 4% | — |
| GDPval (win/tie rate) | 60% | — |
| GPQA Diamond | 86% | 96% |
| GSO (code optimization) | 27% | — |
| Humanity's Last Exam | 25% | 55% |
| LiveCodeBench | 87% | — |
| METR task horizon | 4.9 h | — |
| MMLU-Pro | 90% | — |
| SciCode | 50% | 56% |
| SimpleBench | 62% | — |
| SimpleQA Verified | 46% | 76% |
| SWE-bench Verified | 77% | — |
| Terminal-Bench | 63% | — |
| WebDev Arena | 1494 | 1800 |
| WeirdML | 64% | 94% |
| τ²-bench | 89% | — |
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.