Z
ZAI Language
GLM 5.3
Frontier open coding model with 1M context and emergent cyber defense capability.
About
GLM-5.3 is Z.ai's most capable open-weight model for agentic coding and long-horizon engineering work. It runs on the same MoE base as GLM-5.2, with every gain coming from scaled post-training across realistic task environments. Thinking is always on, with configurable reasoning effort across low, high, and max.
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