gpt-oss-20b and GLM-4-Plus don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GLM-4-Plus shipped 341 days before gpt-oss-20b, so benchmark comparisons should account for the intervening progress.

gpt-oss-20b is open weight, while GLM-4-Plus is proprietary.

Direct benchmark comparisons are unavailable — gpt-oss-20b and GLM-4-Plus don't publish scores on any of the same benchmarks.