Kimi Linear 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 84 days before Kimi Linear, so benchmark comparisons should account for the intervening progress.

Kimi Linear is open weight, while Grok 4 Heavy is proprietary.

Direct benchmark comparisons are unavailable — Kimi Linear and Grok 4 Heavy don't publish scores on any of the same benchmarks.