DeepSeek V3.1 Terminus and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Heavy shipped 75 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.

DeepSeek V3.1 Terminus is open weight, while Grok 4 Heavy is proprietary.

Direct benchmark comparisons are unavailable — DeepSeek V3.1 Terminus and Grok 4 Heavy don't publish scores on any of the same benchmarks.