GLM 5.3 FlashX
GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s.
Specifications
| Lab | Z.ai |
|---|---|
| Context window | 1M tokens |
| Input price | $0.37/1M |
| Output price | $1.25/1M |
| Release | Sep 2026 |
Strengths
- Up to 1M-token context window for long documents and extended agent traces
- Native text, image, and video input with text output
- Reasoning-enabled inference with configurable effort levels
Weaknesses
- FlashX is a speed-focused variant with less headroom than larger GLM models
- OpenRouter pricing and availability may vary by provider
Best for
- Fast multimodal agents with long context
- Video and image understanding
- High-volume coding and reasoning workloads
In Depth: GLM 5.3 FlashX
Summary
GLM 5.3 FlashX is an AI model from Z.ai.
Released in Sep 2026. It takes text, image, and video input and produces text output, with a context window of 1M tokens. Input pricing is $0.37 per 1M tokens and output is $1.25 per 1M tokens on OpenRouter.