Bing just accidentally spilled the beans on Zhipu's next model. The Chinese AI company's ZCode page briefly appeared in search results under the title "GLM-5.3 Official Harness." ZCode is Zhipu's coding companion for GLM, built to plan, write, review, and execute development tasks.
Click through to the actual site, though, and it still says "GLM-5.2 Official Harness." Zhipu's release history, developer docs, and API list all stop at GLM-5.2. There's no sign of a 5.3 anywhere official.
So what does this actually prove? Not much — just that the phrase "GLM-5.3" made its way into ZCode at some point. In the AI world, that's often the closest thing to a launch leak you'll get.