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GPT-6 Astra vs Grok 4.5
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| Attribute | GPT-6 Astra | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 169 | 154 |
| Coding | 93 | 76 |
| Math | 91 | 76 |
| Reasoning & Knowledge | 98 | 56 |
| Agentic & Tools | 90 | 78 |
| Specifications | ||
| Developer | OpenAI | xAI |
| Family | GPT | Grok |
| Released | Sep 3, 2026 | Jul 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1.1M | 500K |
| Price — $/M input | $10.00 | $2.00 |
| Price — $/M output | $50.00 | $6.00 |
| Inputs | file, image, text | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 98% |
| APEX | 65% | 56% |
| ARC-AGI | 99% | 87% |
| ARC-AGI-2 | 95% | 53% |
| GPQA Diamond | 96% | 93% |
| GSO (code optimization) | 79% | — |
| Humanity's Last Exam | 55% | 43% |
| SciCode | 56% | 55% |
| SimpleQA Verified | 76% | 48% |
| WebDev Arena | 1800 | 1555 |
| WeirdML | 94% | 46% |
| SimpleBench | — | 70% |
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.