# 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.

Last verified: 2026-10-26 · Evidence: Reported · Canonical: https://theagenticweekly.com/models/glm-5-1 · JSON: https://theagenticweekly.com/api/models/glm-5-1

## Key facts

| Fact | Value | Source |
|---|---|---|
| Vendor | Z.ai |  |
| Released | Apr 7, 2026 | https://docs.z.ai/release-notes/new-released |

## What we tested

Nothing yet. We have not run GLM-5.1 ourselves, so every fact here is Reported from the sources below.

## Not verified, left out

- Context window, license and price were not captured.

## Sources

- [Z.ai release notes](https://docs.z.ai/release-notes/new-released)

Data licence: CC BY 4.0. Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0.