tech
Everything we know about Z.ai, the Chinese company behind the mysterious Ox Alpha model
Z.ai revealed that mystery AI model Ox Alpha was GLM-5.3-Flash, which it had anonymously tested on OpenRouter and OpenCode.
TL;DR
- Z.ai, a Beijing AI company founded on Tsinghua University technology, revealed it created the popular AI model known as Ox Alpha.
- Ox Alpha was an anonymous test of Z.ai's latest open-weight model, GLM-5.3-Flash, designed to work with text, images, and video.
- The company's previous anonymous model test was for GLM-5 under the name Pony Alpha.
- Z.ai, formerly Knowledge Atlas Technology, listed in Hong Kong in January and has seen significant stock price increases.
- The company operates through cloud-based services and on-premise installations, offering APIs, AI agents, and technical services.
- Z.ai confirmed that the Ox Alpha tests were conducted using Chinese AI chips, despite limitations, by optimizing software and workload distribution.