Mistral NeMo and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Mistral NeMo shipped 410 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.

Mistral NeMo is open weight, while Grok 4 Fast is proprietary.

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