Mistral Small 3.1 and Grok 4 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Mistral Small 3.1 shipped 114 days before Grok 4, so benchmark comparisons should account for the intervening progress.

Mistral Small 3.1 is open weight, while Grok 4 is proprietary.

Direct benchmark comparisons are unavailable — Mistral Small 3.1 and Grok 4 don't publish scores on any of the same benchmarks.