GLM 5.3
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.
Specifications
| Lab | Z.ai |
|---|---|
| Context window | 1.3M tokens |
| Input price | $1.40/1M |
| Output price | $4.40/1M |
| Release | Aug 2026 |
Strengths
- Million-token context window for very long tasks
- Tool-use support for agentic workflows
- Structured output support for reliable application integration
Weaknesses
- Newer listing with limited independent benchmark coverage
- Text-only inputs limit multimodal application coverage
Best for
- Agentic workflows and tool-using applications
- Long-context document and codebase processing
In Depth: GLM 5.3
Summary
GLM 5.3 is an AI model from Z.ai.
Released in Aug 2026. It takes text input and produces text output, with a context window of 1.3M tokens. Input pricing is $1.40 per 1M tokens and output is $4.40 per 1M tokens on OpenRouter.