Mixtral 8×22B and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Mixtral 8×22B shipped 509 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.

Mixtral 8×22B is open weight, while Grok 4 Fast is proprietary.

Direct benchmark comparisons are unavailable — Mixtral 8×22B and Grok 4 Fast don't publish scores on any of the same benchmarks.