Z.ai launches GLM-5.3 with claimed 50% gain on coding benchmark

Z.ai, the international brand of Chinese AI company Zhipu, has launched GLM-5.3, an update focused on coding, long-horizon tasks and cybersecurity. The model uses the same base model as GLM-5.2, with the company attributing the latest gains to post-training.

Z.ai said GLM-5.3 scored 50% higher than GLM-5.2 on its internal Z.ai Code Bench and reached leading open-source results on Terminal-Bench 3.0 and Agents’ Last Exam. It also reported stronger vulnerability-discovery and exploitation performance, and said the model weights will be released two weeks after launch following additional safety evaluation. [Z.ai]