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

Z.ai, the international brand of Chinese AI company Zhipu, 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 gains attributed to post-training. Z.ai claims GLM-5.3 scored 50% higher than GLM-5.2 on its internal Z.ai Code Bench and achieved leading open-source results on Terminal-Bench 3.0 and Agents' Last Exam.