Question 1

What is GLM 5.3?

Accepted Answer

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves on GLM-5.2 in coding and in the balance between performance and token efficiency.

Reasoning is always on and cannot be disabled. Reasoning efforts low, high, and max are supported; max is the default.

Question 2

How much does GLM 5.3 cost?

Accepted Answer

GLM 5.3 costs $1.40/M input tokens and $4.40/M output tokens, with separate rates for Cache Read at $0.26/M tokens.

Question 3

What is the context length of GLM 5.3?

Accepted Answer

GLM 5.3 has a 1,048,576 token context window. It supports up to 131,072 completion tokens.

Question 4

Does GLM 5.3 support tool calling and structured outputs?

Accepted Answer

Yes. GLM 5.3 accepts tools and tool_choice for function calling. It supports response_format for JSON output, without JSON-schema enforcement.

Question 5

What other text models does Z.ai have?

Accepted Answer

GLM 5.2, GLM 5.1, GLM 5V Turbo and 9 more are other text models from Z.ai.

Question 6

When was GLM 5.3 released?

Accepted Answer

GLM 5.3 was released on 2026-08-18.

Z.ai: GLM 5.3

z-ai/glm-5.3

Z.ai: GLM 5.3

z-ai/glm-5.3

Frequently asked questions

Frequently asked questions