GLM-5.3
GLM-5.3 is Zhipu AI (Z.ai)‘s new-generation flagship reasoning model, the successor to GLM-5.2, built for complex software engineering and long-horizon agent tasks. It improves on GLM-5.2 in coding and in the balance between performance and token efficiency. Reasoning is always on and cannot be disabled.
Key Features
- New-Generation Flagship: The latest flagship in the GLM series, built for complex engineering and long-horizon agents
- Always-On Reasoning: Reasoning is enabled by default, with low / high / max effort levels (max is the default)
- Long Context: 1M-token context window for project-level engineering context
- Chinese Specialist: Strong Chinese understanding and generation
Best Use Cases
- Complex Software Engineering: Project-level codebase understanding and long-running development tasks
- Long-Horizon Agents: Multi-step autonomous execution and tool calling
- Chinese Scenarios: Chinese understanding and generation
Specifications
| Item | Detail |
|---|---|
| Platform model ID | glm-5.3 |
| Context window | 1,000,000 tokens |
| Input modalities | Text |
| Output modalities | Text |
| Reasoning / thinking | Supported, always on |
| First released (market) | 2026-08-18 |
| Live pricing | See the model marketplace |
Capabilities and Limitations
| Capability | Description |
|---|---|
| Reasoning | Strong. New-generation GLM flagship, reasoning always on |
| Coding | Strong. Improved over GLM-5.2 |
| Chinese | Strong. Chinese understanding and generation |
| Context Window | 1,000,000 tokens |
| Multimodal | Text input/output only; no image / video |
Last updated on