2 vs 0 benchmarks won
Anthropic Claude Sonnet 4 | xAI Grok 4 Fast | |
|---|---|---|
| Overview | ||
| Company | Anthropic | xAI |
| Release date | May 22 2025 | Sep 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | 75.4% | — |
Software engineering SWE-Bench Verified | 72.7% | — |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Claude Sonnet 4 shipped 102 days before Grok 4 Fast | |
Claude Sonnet 4 leads Grok 4 Fast on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4 shipped 102 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.