# GLM-5.3 FlashX

GLM-5.3 FlashX is a model from Z.ai, first recorded on 18 Sep 2026; its release date is not established. The context window is 1,048,576 tokens. The maximum output is 131,072 tokens. Pricing is $0.37 per million input tokens and $1.25 per million output tokens.

- Developer: Z.ai
- Id: glm-5.3-flashx
- Sighting: 2026-09-18T04:53:45.166Z
  - [evidence link](https://api.z.ai/api/paas/v4/models)
- Status: API availability
- Canonical: https://alexgetman.com/models/z-ai/glm-5-3-flashx/

## Questions

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

The context window is 1,048,576 tokens. The maximum output is 131,072 tokens.

### How much does GLM-5.3 FlashX cost?

Pricing is $0.37 per million input tokens and $1.25 per million output tokens. Cached input is $0.075 per million.

### When was GLM-5.3 FlashX released?

Its release date is not established. Signal Forge first recorded it on 18 Sep 2026.

## Evidence links

- 2026-09-18T04:53:45.166Z: Catalogue listing · Z.ai API · `glm-5.3-flashx`

## Evidence links

- [zai](https://api.z.ai/api/paas/v4/models)
- [zai-model-index](https://docs.z.ai/api-reference/llm/chat-completion)
- [Z.ai API](https://docs.z.ai/guides/llm/glm-4.6)
- [zai-pricing](https://docs.z.ai/guides/overview/pricing)
- [review](https://docs.z.ai/guides/vlm/glm-5.3-flash)
- [models.dev · catalogue](https://models.dev/#glm-5.3-flashX)
- [models.dev · catalogue](https://models.dev/#glm-5.3-flashx)
- [OpenRouter](https://openrouter.ai/z-ai/glm-5.3-flashx)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)

## Signals

- [GLM-5.3 FlashX spotted on Z.ai API](https://alexgetman.com/signals/2026/09/18/glm-5-3-flashx/)