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Z.ai released GLM-5.3, a coding/agent model built on the same base model as GLM-5.2 but improved via scaled post-training

Model release ● Confirmed 78% confidence first seen

Z.ai launched GLM-5.3, retaining the same 743B base model as GLM-5.2 while applying scaled post-training to improve coding and long-horizon performance. Coverage reports substantial benchmark gains on Terminal-Bench 3.0 and CyberGym, with partial availability via the Z.ai API and planned model-weights release after a post-launch safety and hardening period.

GLM-5.3 Z.ai CyberGym DeepSWE v1.1 ExploitBench GLM-5.2 GLM-5.3 Coding Plan Terminal-Bench 3.0 The New Stack Z.ai API

Source coverage

GLM-5.3 Product Hunt social Z.ai Ships GLM-5.3 Without Retraining the Base Model: Better at Complex Coding and Long-Horizon Tasks MarkTechPost GLM-5.3 didn’t change the base model — where did its coding gains come from? The New Stack

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