Devstral 2 (123B) and Grok Code Fast 1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok Code Fast 1 shipped 103 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.

Devstral 2 (123B) is open weight, while Grok Code Fast 1 is proprietary.

Direct benchmark comparisons are unavailable — Devstral 2 (123B) and Grok Code Fast 1 don't publish scores on any of the same benchmarks.