Gemini 3.1 Flash and Devstral Small don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Devstral Small shipped 281 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

Gemini 3.1 Flash is proprietary, while Devstral Small is open weight.

Direct benchmark comparisons are unavailable — Gemini 3.1 Flash and Devstral Small don't publish scores on any of the same benchmarks.