Kimi Linear and GPT-5 nano don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5 nano shipped 55 days before Kimi Linear, so benchmark comparisons should account for the intervening progress.

Kimi Linear is open weight, while GPT-5 nano is proprietary.

Direct benchmark comparisons are unavailable — Kimi Linear and GPT-5 nano don't publish scores on any of the same benchmarks.