Z.ai Unmasks Ox Alpha as GLM-5.3-Flash, Drawing 13 Million Weibo Views
Updated
Updated · Business Insider · Aug 27
Z.ai Unmasks Ox Alpha as GLM-5.3-Flash, Drawing 13 Million Weibo Views
3 articles · Updated · Business Insider · Aug 27
Summary
Z.ai said its mystery Ox Alpha model was a free preview of GLM-5.3-Flash, anonymously tested on OpenCode and OpenRouter from Aug. 20 to gather user feedback.
The company said the model became OpenRouter's most popular model of the week, with all traffic served on Chinese AI chips — a detail Chinese users highlighted as proof domestic hardware can handle large-scale AI demand.
13 million Weibo views in under 24 hours pushed the ownership hashtag into the platform's top 20 topics, with users praising the model's performance and unusually low cost.
U.S. validation added to the buzz after Stripe CEO Patrick Collison called the model "very impressive," extending attention beyond China.
The reveal adds to a run of Chinese open and open-weight model launches, after Moonshot AI's Kimi K3 in July and Alibaba's Qwen3.8-Flash-Next on Wednesday.