DeepSeek Chat (R1-based) and o3-mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek Chat (R1-based) shipped 11 days before o3-mini, so benchmark comparisons should account for the intervening progress.

DeepSeek Chat (R1-based) is open weight, while o3-mini is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek Chat (R1-based) and o3-mini don't publish scores on any of the same benchmarks.