Mystery AI model Ox Alpha draws developers with free access

Ox Alpha, a free "stealth model" launched August 20 on OpenRouter, offers a 1M context window, multimodal input, and zero data retention. It tops Claude Fable 5 and GPT-5.6 Sol on early DeepSWE tests, though full 113-task runs landed near 63%, roughly level with GPT-5.6 Sol. Speculation points to Zhipu AI's GLM-5.3 family.