GPT-5.1-Codex-Max and GLM-4-9B don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GLM-4-9B shipped 532 days before GPT-5.1-Codex-Max, so benchmark comparisons should account for the intervening progress.

GPT-5.1-Codex-Max is proprietary, while GLM-4-9B is open weight.

Direct benchmark comparisons are unavailable — GPT-5.1-Codex-Max and GLM-4-9B don't publish scores on any of the same benchmarks.