DeepSeek V3 Base and o3-mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3 Base shipped 61 days before o3-mini, so benchmark comparisons should account for the intervening progress.

DeepSeek V3 Base is open weight, while o3-mini is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek V3 Base and o3-mini don't publish scores on any of the same benchmarks.