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Z.ai · First-party API · LLM

GLM-5.1

Release announcedReleased on Apr 7, 2026

Z.ai released GLM-5.1 on Apr 7, 2026. Source: docs.z.ai · Last checked Oct 23, 2026

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Release announced

Released on Apr 7, 2026

Z.ai announced this model on 2026-04-07.

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First-party API
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Not stated in the notice
Announced
Apr 7, 2026
First seen by ModelClock
Oct 15, 2026

What the provider published

docs.z.ai ↗

2026-04-07 GLM-5.1

Designed for long-horizon tasks, GLM-5.1 can work independently for up to 8 hours in a single run, enabling a full loop from planning and execution to iterative refinement and final delivery.

It demonstrates stronger engineering intelligence across autonomous planning, sustained execution, bug fixing, and strategy iteration, while achieving comprehensive capability alignment with Claude Opus 4.6. Built with multi-turn SFT, RL, and a process-quality evaluation framework, GLM-5.1 further improves stability, consistency, and tool use over extended tasks. Learn more in our documentation .*

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