Ox Alpha

Z.ai, maker of the GLM model series, has confirmed it is behind Ox Alpha, the mysterious open-weight model that appeared anonymously on OpenRouter and topped benchmark leaderboards. The company will release the model's weights on Wednesday.

A new AI model called Ox Alpha appeared on OpenRouter this week, listed only as being built by an anonymous third-party provider. Speculation about its creator has ranged from Z.ai's GLM models to an unreleased version of Microsoft's MAI, with no confirmation yet.

A stealth model called Ox Alpha has appeared on OpenRouter, offering a 1 million token context window at no cost during its preview period. The model's developer remains anonymous, and OpenRouter says it is acting only as a router, not the model's owner or provider.