Zhipu AI shares jump as viral Ox Alpha model revealed as GLM-5.3-Flash on Chinese chips

China’s Zhipu AI has launched its latest open-weight model, GLM-5.3-Flash – previously code-named Ox Alpha – saying that the system ran entirely on a cluster of 100,000 domestically produced chips during a high-profile stealth trial. The announcement followed a week of heavy traffic on artificial intelligence model mar

The Chinese AI company said it had already launched the model globally in stealth mode for a week.

Z.ai, the Chinese AI company also known as Zhipu, is behind Ox Alpha, the free model that captivated developers. CFOTO/Future Publishing via Getty Images The mystery maker of Ox Alpha is the Chinese tech company Z.ai. The free model drew developer attention after appearing anonymously on OpenRouter last week. Ox Alpha

Z.ai confirms it is behind Ox Alpha, the mysterious open AI model topping benchmarks and leaderboards, and its weights are set to be released soon.