Who’s behind the new ‘stealth model’ Ox Alpha?

A new AI model named Ox Alpha, described as a “reasoning model designed for coding, sustained agentic work, and production workload,” has sparked widespread speculation regarding its origin. Released on OpenRouter, the model is currently attributed to an anonymous third-party provider. Initial theories pointed to China's Z.ai and its GLM models, but later speculation included an unreleased version of Microsoft’s MAI, with online discussions remaining divided on whether Ox Alpha is of Chinese origin.