Zhipu AI releases GLM-5.2 under an open MIT licence

China's open model momentum is not slowing down. Zhipu AI released GLM-5.2 under a permissive MIT licence, a large mixture of experts model with a usable one million token context window.

The MIT licence is the headline. It means teams can self host, fine tune, and ship commercial products on top of GLM-5.2 without the usage restrictions that come with closed APIs. For organisations that cannot send sensitive data to a third party, or simply want to control their own costs, a capable open model with a huge context window is a serious option.

This fits a pattern that ran right through the first half of 2026. DeepSeek, Alibaba, Moonshot, MiniMax, and now Zhipu have all shipped strong open models, and the Stanford AI Index reported that Chinese labs have effectively closed the performance gap with their US rivals.

Our take: if you have written off open models as second tier, it is worth a fresh look. The gap between the best closed API and a self hosted open model is now small enough that data control and cost often tip the decision.