GLM-5.3 is now open-weight

GLM-5.3, an open-weight model, shares its base with GLM-5.2, with all improvements stemming from post-training. It demonstrates enhanced performance in complex coding and long-horizon tasks. Key metrics show significant gains: Toolathlon Verified at 78.0, AutomationBench (v1.0.6) at 48.2, HLE w/ Tools at 28.6, and GDPval-AA v2 at 1769. The model's development is attributed to the GLM-5-Team and numerous contributors, as detailed in the paper "GLM-5: from Vibe Coding to Agentic Engineering."