DeepSeek V3 Chat and Gemini 3.1 Flash don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3 Chat shipped 452 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

DeepSeek V3 Chat is open weight, while Gemini 3.1 Flash is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek V3 Chat and Gemini 3.1 Flash don't publish scores on any of the same benchmarks.