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Claude Sonnet 4.5 vs Grok 4.5
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| Attribute | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 147 | 154 |
| Coding | 31 | 89 |
| Math | 32 | 84 |
| Reasoning & Knowledge | 28 | 68 |
| Agentic & Tools | 27 | 74 |
| Specifications | ||
| Developer | Anthropic | xAI |
| Family | Claude | Grok |
| Released | Sep 29, 2025 | Jul 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 500K |
| Price — $/M input | $3.00 | $2.00 |
| Price — $/M output | $15.00 | $6.00 |
| Inputs | text, image, file | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 78% | 98% |
| ARC-AGI | 64% | 87% |
| ARC-AGI-2 | 14% | 53% |
| FrontierMath | 15% | — |
| FrontierMath Tier 4 | 4% | — |
| GDPval (win/tie rate) | 50% | — |
| GPQA Diamond | 82% | 93% |
| GSO (code optimization) | 15% | — |
| Humanity's Last Exam | 14% | 40% |
| MATH Level 5 | 98% | — |
| METR task horizon | 2.0 h | — |
| SimpleBench | 54% | 70% |
| SimpleQA Verified | 24% | 54% |
| SWE-bench Verified | 71% | — |
| Terminal-Bench | 47% | — |
| WebDev Arena | 1391 | 1551 |
| WeirdML | 48% | 46% |
| APEX | — | 34% |
| SciCode | — | 54% |
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.