A mysterious free AI model is impressing developers. And nobody knows who made it.

The new Ox Alpha AI model is turning heads in Silicon Valley, but no one knows its origin, much like this stone carving on display at the Shanxi Bronze Museum in China. Zhe Ji/Getty Images Ox Alpha, a mysterious AI model, debuted on OpenRouter on Thursday. Its origins are unknown. Some think it's from a Chinese lab, others that it has ties to Microsoft. Wherever it's from, Ox Alpha has impressed Silicon Valley tech leaders. A mysterious new AI model is making the rounds among developers — and…