GLM-5.3

Z.ai released GLM-5.3 on August 14, 2026, delivering massive benchmark improvements in terminal automation, coding, and cybersecurity. We analyze the scaled reinforcement learning that drove these post-training gains on the 743B MoE architecture.

Z.ai released GLM-5.3 on August 14, 2026 — a 743-billion parameter Mixture-of-Experts model. While sharing the same base architecture as GLM-5.2, scaled post-training pushes its Terminal-Bench 3.0 performance from 4.6% to 28.3%.