Z.ai Ships GLM-5.3 Without Retraining the Base Model: Better at Complex Coding and Long-Horizon Tasks

Z. ai released GLM-5. 3 on August 14, 2026. The model reuses the 743B GLM-5. 2 base unchanged. Every reported gain comes from scaled post-training: more long-horizon task environments, more environment types, longer training. Terminal-Bench 3. 0 moves from 4. 6 to 28. 3, and DeepSWE v1. 1 from 46.

2 to 66. 9. Cybersecurity moved further than Z. ai says it planned, with CyberGym at 84. 5% and ExploitBench more than doubling to 54. 4%. Weights arrive in about two weeks. The post Z. ai Ships GLM-5.