Everything we know about Z.ai, the Chinese company behind the mysterious Ox Alpha model
Everything we know about Z.ai, the Chinese company behind the mysterious Ox Alpha model
摘要: AI
Everything we know about Z.ai, the Chinese company behind the mysterious Ox Alpha model
Huileng Tan
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Everything we know about Z.ai, the Chinese company behind the mysterious Ox Alpha model
Huileng Tan
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Z.ai chairman and cofounder Liu Debing marks the company's debut on the Hong Kong Stock Exchange in January 2026.
Lam Yik/Bloomberg/Getty Images
2026-08-28T07:28:03.397Z
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For days, one of the most popular AI models of the week had no known maker.
Ox Alpha
was free to try, impressive at coding, and mysterious enough to set developers guessing about which major AI lab was behind it.
Z.ai revealed itself.
Beijing AI company
said this week that Ox Alpha was the name it had used to anonymously test GLM-5.3-Flash, its latest open-weight model, on OpenRouter and OpenCode.
The stunt has put the newly public company in the spotlight as China's AI race heats up.
Z.ai is up against DeepSeek,
Moonshot AI
— the company behind Kimi — and Alibaba's Qwen team. They're competing on performance and price, while trying to make the most of limited computing power.
Here's what to know.
Z.ai grew out of a top Chinese university
Z.ai, also known in China as Zhipu AI, says it was founded in 2019 based on technology developed at Tsinghua University in Beijing.
The company developed GLM, short for General Language Model, its family of large language models. It launched its chatbot, ChatGLM, in 2023.
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