Vercel CEO "Shocked" by Z.AI GLM-5.2 Coding Prowess

The CEO of Vercel, Guillermo Rauch, is "genuinely impressed, almost shocked" by the coding abilities of Z.AI's new open-weight AI model, GLM-5.2. Vercel integrated the model into its AI Gateway within three days of its release. Here's the thing: GLM-5.2 trails the leading closed model, Claude Opus 4.8, by only 1% on key coding evaluations like FrontierSWE. This model shows a significant improvement over its predecessor, GLM-5.1, with a 28% jump in Terminal-Bench scores. It also supports 1 million tokens, a five-fold increase, allowing it to handle large codebases. What's interesting is that Z.AI made GLM-5.2 available for developers to run on their own hardware. This rapid adoption by Vercel suggests GLM-5.2 could see meaningful production usage. The bottom line: an open-weight model performing this close to top closed models could change how developers approach AI coding tools.