Gemini 1.5 Flash and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 1.5 Flash shipped 574 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.

Gemini 1.5 Flash is proprietary, while Devstral 2 (123B) is open weight.

Direct benchmark comparisons are unavailable — Gemini 1.5 Flash and Devstral 2 (123B) don't publish scores on any of the same benchmarks.