GLM-5.3
Open reasoning model for complex software engineering and long-horizon agents.
GLM-5.3 is a large-scale reasoning model from Z.ai built for complex software engineering and long-horizon agent tasks, with a 1M-token context window.
- Provider
- Z.ai
- Type
- Language model
- Released
- Aug 18, 2026
- Context window
- 1M tokens
- Max output
- 944K tokens
- Price
- $0.039 input / $4.80 output per 1M tokens
- Input
- text
- Output
- text
- Open weights
- Yes
- License
- MIT
Best for
- Coding
- Agents
- Reasoning
- Long context
Strengths
- High intelligence for an open model
- Fast first token
More from Z.ai
- GLM-5.3 Flash — Z.ai. Native multimodal open model with hybrid sparse/linear attention for long context.