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GLM-5.3-Flash is Z.ai’s efficient open-weight model. It’s small, yet outperforms GLM-5.2 at about one-tenth the price. If you need better performance for more complex tasks, try Z.ai’s flagship: GLM-5.3. To use GLM-5.3-Flash, 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-Flash with the OpenAI-compatible Chat Completions API.

Control Reasoning

Edit GLM-5.3-Flash’s reasoning parameters.

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Last modified on August 31, 2026