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GLM-5.3 is Z.ai’s latest flagship open-weight model. It uses the same base model as GLM-5.2, but it’s better at coding and discovering security vulnerabilities — all for the same price. For simpler tasks, you can set a lower reasoning effort, though you can’t turn reasoning off. For even more efficiency, try GLM-5.3-Flash. To use GLM-5.3, see the following model properties: To estimate costs, see how tokens are priced:

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Choose a Model Feature

Choose what you’d like to do with the model:

Send Requests

Connect to GLM-5.3 with the OpenAI-compatible Chat Completions API.

Control Reasoning

Edit GLM-5.3’s reasoning parameters.

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Other Resources

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Last modified on August 31, 2026