DeepSeek V3.1 Terminus and o1 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o1 shipped 291 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.

DeepSeek V3.1 Terminus is open weight, while o1 is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek V3.1 Terminus and o1 don't publish scores on any of the same benchmarks.