Gemini 3.1 Flash and Kimi-Dev don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi-Dev shipped 270 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

Gemini 3.1 Flash is proprietary, while Kimi-Dev is open weight.

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