Compare AI models
| Specifications | ||
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality. | — | 9B |
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 2M | 128k |
| Overview | ||
| Company | SpaceXSI | Z.ai |
| Release date | Sep 19 2025 | Jun 5 2024 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Grok 4 FastvsClaude Haiku 5.5GLM-4-9BvsClaude Haiku 5.5Grok 4 FastvsGPT-6.1 SolGLM-4-9BvsGPT-6.1 SolGrok 4 FastvsGemini 4 ArgonGLM-4-9BvsGemini 4 ArgonGrok 4 FastvsMuse Spark OpenGLM-4-9BvsMuse Spark OpenGrok 4 FastvsDeepSeek-V4.1-Flash-1017GLM-4-9BvsDeepSeek-V4.1-Flash-1017Grok 4 FastvsMistral Large 4GLM-4-9BvsMistral Large 4Frequently asked questions
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 471 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 2M (Grok 4 Fast) vs 128k (GLM-4-9B). Grok 4 Fast is closed, 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.