A stealth model appeared and nobody knows who is behind it
Ox Alpha was released free on OpenRouter. The provider chose to stay anonymous during the preview, and guesses swing between China and Microsoft.
Models
Coding models
Zhipu AI's GLM-5.3: the gains come from extended post-training, not a new base
Chinese firm Zhipu AI has released GLM-5.3. The model shares the same base as its predecessor and all gains come from extended post-training alone. The company also reports finding 2,436 vulnerabilities across 269 projects with security teams.
Models