Z.AI: GLM 5.3
GLM-5.3 is Z.AI's flagship open-source reasoning model, built for complex software engineering and long-horizon agent tasks. It reasons on every request and supports a 1M-token context window for working across large codebases and document sets, alongside native tool calling and structured JSON outputs.
It improves on GLM-5.2 in coding and in the balance between performance and token efficiency, making it a strong open-weight pick for agentic planning, multi-step refactors, and iterative self-correction.
Capabilities
How to use
- Describe your coding task or paste the files and context you want it to work through
- GLM 5.3 reasons through the problem and carries out multi-step engineering workflows end to end
- Continue the conversation to refine, debug, or extend the result
Tip: Give context and say what format you want the answer in.
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