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GPT-5.5 vs GPT-6 Astra
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| Attribute | GPT-5.5 | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 159 | 169 |
| Coding | 84 | 95 |
| Math | 73 | 96 |
| Reasoning & Knowledge | 83 | 99 |
| Agentic & Tools | 83 | 96 |
| Specifications | ||
| Developer | OpenAI | OpenAI |
| Family | GPT | GPT |
| Released | Apr 23, 2026 | Sep 3, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1.1M | 1.1M |
| Price — $/M input | $5.00 | $10.00 |
| Price — $/M output | $30.00 | $50.00 |
| Inputs | file, image, text | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 84% | 100% |
| APEX | 39% | 47% |
| ARC-AGI | 95% | 99% |
| ARC-AGI-2 | 85% | 95% |
| FrontierMath | 52% | — |
| FrontierMath Tier 4 | 35% | — |
| GPQA Diamond | 91% | 96% |
| GSO (code optimization) | 40% | — |
| Humanity's Last Exam | 46% | 55% |
| SciCode | 56% | 56% |
| SimpleBench | 69% | — |
| SimpleQA Verified | 63% | 76% |
| SWE-bench Verified | 81% | — |
| Terminal-Bench | 85% | — |
| WebDev Arena | 1508 | 1797 |
| WeirdML | 85% | 93% |
| τ²-bench | 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.