Z.ai claims Ox Alpha, tested anonymously as GLM-5.3

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Key Takeaways

1Z.ai claims that Ox Alpha is a free version of GLM-5.3-Flash tested anonymously on OpenRouter and OpenCode.

2On Weibo, the hashtag related to this claim surpassed 13 million views in less than 24 hours and made it into the top 20.

3Alibaba has released Qwen3.8-Flash-Next, an open-weight model that promises to reduce training and inference costs.

💡Why it matters — Z.ai's identification of Ox Alpha is accompanied, according to the company, by a test run on Chinese chips and comes amid a series of launches of open-weight models in China.

Z.ai claims to have launched Ox Alpha as a free version of GLM-5.3-Flash and initially offered it incognito on OpenRouter and OpenCode. The company asserts that peak usage was served on Chinese AI chips and that the model was the most popular of the week. The announcement sparked significant excitement on Weibo, while Alibaba and Moonshot AI are ramping up their open-weight models.

Weibo garners over 13 million views in less than 24 hours

By noon on Thursday, a hashtag dedicated to Z.ai's claim was among the top 20 trending topics on Weibo, already accumulating thousands of posts. In less than 24 hours, this same hashtag surpassed 13 million views. Chinese internet users have been following the saga of Ox Alpha since its launch the previous week and even nicknamed it "Niu Lai" over the weekend, a nod to an animated film released in August that has inspired a plethora of memes. The buzz extended beyond China: Patrick Collison, CEO of Stripe, indicated on X that he tested the model and found it "very impressive."

Z.ai claims Ox Alpha after anonymous testing

On Wednesday, Z.ai claimed ownership of Ox Alpha and explained that it had disguised GLM-5.3-Flash under this name. In its post, the company states that Ox Alpha was a free version of its new model, which appeared on OpenRouter and OpenCode on August 20. For several days, no team claimed it, fueling online debates about its origin. Z.ai says it wanted to gather feedback by anonymously testing GLM-5.3-Flash on these platforms and asserts that the model became the most popular of the week. The company adds that all of this traffic was served on AI chips produced in China.

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Alibaba releases Qwen3.8-Flash-Next, an open-weight model

On the same Wednesday, Alibaba announced Qwen3.8-Flash-Next, an open-weight model focused on efficiency and presented with the promise of reduced training and inference costs. This episode is part of a broader trend where GLM-5.3-Flash is seen as generating interest beyond China. In July, Moonshot AI launched Kimi K3, also open-weight, described as competing with models from OpenAI and Anthropic at a lower cost.

On Weibo, users comment on cost and local chips

Among the reactions, a user located in Beijing deemed the model "incredible," citing good performance for a low cost. In Chongqing, another user suggested that the significance of Ox Alpha signals a step forward for Chinese open-source models in the global developer market. In Sichuan, messages praised the use of locally produced chips, with some believing these components effectively support large-scale AI applications, while others labeled the model as "ridiculously cheap." Historically, Weibo users have highlighted perceived breakthroughs from Chinese labs abroad; in July, some referred to Moonshot AI founder Yang Zhilin as a "millennial genius."