Anthropic Claude 2.1 vs xAI Grok 4 Fast — side-by-side specs.
Anthropic Claude 2.1 | xAI Grok 4 Fast | |
|---|---|---|
| Overview | ||
| Company | Anthropic | xAI |
| Release date | Nov 21 2023 | Sep 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
| Timeline | ||
| Release gap | Claude 2.1 shipped 650 days before Grok 4 Fast | |
Claude 2.1 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2.1 shipped 650 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 — Claude 2.1 and Grok 4 Fast don't publish scores on any of the same benchmarks.