Z.ai’s GLM-5.3 goes open weight, but its new license aims at hyperscalers

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Earlier in August, Z.ai, the Chinese AI lab behind the viral ox-alpha model that turned out to be GLM-5.3-Flash, launched its flagship GLM-5.3 model. On Friday, the company made the weights of the model available on Hugging Face, which may soon be owned by Nvidia. A number of third-party inference services already host it and make it available on services like OpenRouter, which will soon be owned by Stripe.

As The New Stack’s Amanda Caswell reported when the model originally launched, Z.ai’s focus on training GLM-5.3 was on post-training. The result of that isn’t simply a large jump in benchmark performance over its predecessor, GLM-5.2, but a model that is often ahead of other Chinese open-weight models and able to keep pace with current models from the large U.S. frontier labs.

A new license only hyperscalers won’t love

One thing Z.ai definitely changed is the model’s license. While GLM-5.2 shipped under the permissive MIT license, the new model ships under what the company calls the GLM-5.3 license and it has one major caveat: companies that want to host the model (not just route it like OpenRouter or embed it into a product), and have an aggregate revenue of more than $10 billion over any 12 consecutive months, “must pass Z.AI’s security review before using the Software or its derivative works for any commercial purpose.”

For individual users, nothing really changes — the license is more specific to models and includes the rights to run, deploy, and fine-tune. But for hyperscalers (and the neoclouds — once they hit these revenue numbers), there are now hoops to …

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