27 August 2026
Chinese lab Z AI reveals mystery model as GLM-5.3-Flash
First reported
AI Business, TLDR AI and 1 other ran this on , all on the same day.
- Z AI disclosed that Ox Alpha, an anonymous model that ranked highly on OpenRouter, is their new GLM-5.3-Flash.
- GLM-5.3-Flash uses a mixture-of-experts architecture, a technique where only part of the model activates per query, enabling cheap inference.
Where they differ
Reported by AI Business