gpt-oss-20b and Grok 3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 3 shipped 169 days before gpt-oss-20b, so benchmark comparisons should account for the intervening progress.

gpt-oss-20b is open weight, while Grok 3 is proprietary.

Direct benchmark comparisons are unavailable — gpt-oss-20b and Grok 3 don't publish scores on any of the same benchmarks.