Mystery AI model Ox Alpha appears free on OpenRouter

Ox Alpha, a free "stealth model" with a 1M context window and multimodal input, launched August 20 on OpenRouter. Early viral claims it beats Claude Fable 5 and GPT-5.6 Sol on DeepSWE came from a 10-task sample; full 113-task runs landed near 63%, roughly level with GPT-5.6 Sol. Speculation points to Zhipu AI's GLM-5.3 family.