DeepSeek V2.5 and o3-mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V2.5 shipped 152 days before o3-mini, so benchmark comparisons should account for the intervening progress.

DeepSeek V2.5 is open weight, while o3-mini is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek V2.5 and o3-mini don't publish scores on any of the same benchmarks.