Grok 4 Fast 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 453 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.

Grok 4 Fast is proprietary, while GLM-4-9B is open weight.

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