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.
Modalities
In / Out Price
$1.40 / $4.40per 1M
Context
1M
Released
Aug 18, 2026
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.
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.
GLM 5.3 has a 1,048,576 token context window. It supports up to 131,072 completion tokens.
Yes. GLM 5.3 accepts tools and tool_choice for function calling. It supports response_format for JSON output, without JSON-schema enforcement.
GLM 5.2, GLM 5.1, GLM 5V Turbo and 9 more are other text models from Z.ai.
GLM 5.3 was released on August 18, 2026.