DeepSeek V3 Base 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 Base shipped 452 days before Gemini 3.1 Flash, so benchmark comparisons should account for the intervening progress.

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

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