Z.ai · llm model
GLM-5.1
GLM-5.1 is a Z.ai language model released Apr 7, 2026; Z.ai's newest language model in our dataset is GLM-5.3-Flash. Z.ai's GLM-5.1, released Apr 7, 2026 and designed for long-horizon tasks of up to 8 hours in a single run. Verified against vendor sources on Oct 26, 2026.
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- ReleasedApr 7, 2026
Modalities not verified
Key facts
| Fact | Value | Source |
|---|---|---|
| Vendor | Z.ai | n/a |
| Released | Apr 7, 2026 | source |
| Status | generally available | n/a |
Where GLM-5.1 sits in our data
- Released Apr 7, 2026 (week 15 of 2026), in April 2026. Other models in our data released that month: Mistral Medium 3.5, GPT-5.5, GPT-5.5 Pro, Qwen3.6-27B, GPT-Image-2, Claude Opus 4.7.
- The previous Z.ai model we track is GLM-5 (Feb 12, 2026), 54 days earlier.
- All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.
How GLM-5.1 differs from GLM-5
Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.
- GLM-5.1 came out 54 days after GLM-5.
- Facts for the other model: GLM-5.
What we tested
Nothing yet. We have not run GLM-5.1 ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.
Not verified, left out
We could not confirm these on a vendor page, so we do not state them.
- Context window, license and price were not captured.
Sources
More from Z.ai
- GLM-5 (Feb 12, 2026)
- GLM-5.2 (Jun 16, 2026)
- GLM-Image (Jan 14, 2026)
- GLM-5.3 (Aug 14, 2026)
- GLM-5.3-Flash (Aug 26, 2026)