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.
In January 2026, Z.ai chairman and cofounder Liu Debing marked the company's debut on the Hong Kong Stock Exchange. The mystery AI model Ox Alpha was actually Z.ai's new GLM-5.3-Flash model, which it revealed after days of speculation. Ox Alpha was free to try, impressing users with its coding abilities and remaining mysterious enough to leave developers guessing.
The Beijing AI company confirmed that Ox Alpha was its GLM-5.3-Flash model, which runs on Chinese AI chips despite US technology restrictions. Z.ai was founded in 2019 based on technology developed at Tsinghua University in Beijing and went public in January, with its shares trading at around HK$1,100, nine times its IPO price. The company reports its results on June 15th, 2026.
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