Zhipu's next-gen GLM-5.3 leaks in Bing before the company says a word

Zhipu's next-generation model, GLM-5.3, may have leaked early. Bing search results briefly indexed the ZCode page title as "GLM-5.3 Official Harness." ZCode is Zhipu's coding companion for GLM, built to plan, write, review, and execute development tasks.

But open the official site right now and it still says "GLM-5.2 Official Harness." Zhipu's model release log, developer docs, and API list only go up to GLM-5.2. No sign of GLM-5.3.

What we know so far: "GLM-5.3" did make it into ZCode's search index. Whether that was a test title or early configuration is anyone's guess.

Yesterday, Li Zixuan, global head of Zhipu's Z.ai, publicly asked users whether GLM-5.2 still cuts it given the flood of new models — which sounds a lot like warming up for a launch.