DeepSeek V3 Chat and o3-pro don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3 Chat shipped 191 days before o3-pro, so benchmark comparisons should account for the intervening progress.

DeepSeek V3 Chat is open weight, while o3-pro is proprietary.

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