Grok 4.1 Fast vs GLM-4-9B
xAI Grok 4.1 Fast | Z.ai GLM-4-9B | |
|---|---|---|
| Overview | ||
| Company | xAI | Z.ai |
| Release date | Nov 19 2025 | Jun 5 2024 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 9B |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 19% | — |
| Timeline | ||
| Release gap | GLM-4-9B shipped 532 days before Grok 4.1 Fast | |
Which is better: Grok 4.1 Fast or GLM-4-9B?
Grok 4.1 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 532 days before Grok 4.1 Fast, so benchmark comparisons should account for the intervening progress.
Grok 4.1 Fast is proprietary, while GLM-4-9B is open weight.
Direct benchmark comparisons are unavailable — Grok 4.1 Fast and GLM-4-9B don't publish scores on any of the same benchmarks.
Frequently asked questions
Grok 4.1 Fast was released by xAI on Nov 19 2025.
GLM-4-9B was released by Z.ai on Jun 5 2024.
Grok 4.1 Fast is a proprietary model released by xAI. GLM-4-9B is an open weight model released by Z.ai.
Other comparisons
Grok 4.1 Fast vs Claude Fable 5GLM-4-9B vs Claude Fable 5Grok 4.1 Fast vs GPT-5.6 SolGLM-4-9B vs GPT-5.6 SolGrok 4.1 Fast vs Gemini OmniGLM-4-9B vs Gemini OmniGrok 4.1 Fast vs Muse SparkGLM-4-9B vs Muse SparkGrok 4.1 Fast vs DeepSeek-V4-ProGLM-4-9B vs DeepSeek-V4-ProGrok 4.1 Fast vs Mistral Medium 3.5GLM-4-9B vs Mistral Medium 3.5