GLM-5.1 Blog

Apr 19, 2026
GLM-5.1

How to Use GLM-5.1 API

GLM-5.1 is Z.ai’s flagship open-source model (released April 7, 2026) optimized for long-horizon agentic tasks like autonomous coding and multi-step reasoning. To use the GLM-5.1 API, use CometAPI for cheaper unified access, get your API key