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

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

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