# GLM-5.3 Prime

GLM-5.3 Prime is a model from Z.ai. Release date unknown. The context window is 1,000,000 tokens. The maximum output is 131,072 tokens.

- Developer: Z.ai
- Id: glm-5.3-prime
- Status: API availability
- Canonical: https://alexgetman.com/models/z-ai/glm-5-3-prime/

## Questions

### What is the context window of GLM-5.3 Prime?

The context window is 1,000,000 tokens. The maximum output is 131,072 tokens.

### When was GLM-5.3 Prime released?

Release date unknown

## Evidence links

- [OpenRouter](https://openrouter.ai/z-ai/glm-5.3-prime)
- [Alibaba Model Studio API](https://www.alibabacloud.com/help/en/model-studio/models)

## Signals

- [GLM-5.3 Prime spotted on Alibaba Model Studio API](https://alexgetman.com/signals/2026/09/21/z-ai-glm-5-3-prime-20260921/)