GLM-5.3 is now open-weight
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An official release brings Hugging Face model updates — worth tracking for capability changes, ecosystem impact, and follow-up.
GLM-5.3, an open-weight model, shares its base with GLM-5.2, with all improvements stemming from post-training. It demonstrates enhanced performance in complex coding and long-horizon tasks. Key metrics show significant gains: Toolathlon Verified at 78.0, AutomationBench (v1.0.6) at 48.2, HLE w/ Tools at 28.6, and GDPval-AA v2 at 1769. The model's development is attributed to the GLM-5-Team and numerous contributors, as detailed in the paper "GLM-5: from Vibe Coding to Agentic Engineering."
GLM-5.3 uses the same base model as GLM-5.2 — every gain comes from post-training. Compared with GLM-5.2, it is much better at complex coding and long-horizon tasks:
- Stronger Coding: GLM-5.3 is the most capable open-weights model for coding, with a 50% improvement over GLM-5.2 on our in-house Z.ai Code Bench. It also achieve open-source SOTA on public benchmarks including Terminal Bench 3.0 and Agents' Last Exam.
- Emergent Cyber Capability: As we scaled post-training, cyber capability developed faster than we expected. GLM-5.3 is state of the art on CyberGym for vulnerability discovery, and its gains are largest further up the exploitation chain, where it more than doubles GLM-5.2 on exploitation benchmarks.
Benchmark
Benchmark GLM-5.3 GLM-5.2 Kimi K3 DeepSeek-V4 Pro-0813 Qwen3.8-Max Opus 4.8 Fable 5 (w/ fallback) GPT-5.6 Sol
Terminal Bench 2.1 88.2 81.0 88.3 87.9 86.6 85.0 88.0 88.8
Terminal Bench 3.0 28.3 4.6 17.4
21.1 33.7 34.6
DeepSWE (v1.1) 66.9 46.2 67.5 62.7 56.6 58.0 69.7 72.7
NL2Repo 58.0 48.9 58.0 61.1 55.9 69.7
ProgramBench (Almost Solved) 19.0 9.5 17.5
10.5 15.5 33.0 23.0
FrontierSWE 78.1 67.5
66.5 88.2
SWE-Marathon (v1.1) 42.5 19.4 48.1
48.8 33.1 42.5
PostTrainBench 39.8 31.7 32.0
32.9 41.8 36.2
CyberGym 84.5 77.2 80.0 83.3 78.5 78.1 83.8 83.6
ExploitGym (2h / 6h) 105 / 130 29 / 39 36 / 70
14 / 26 80 / 120 181 / 247 216 / 293
ExploitBench 54.4 24.4 32.2
28.8 40.0 78.0 76.5
Toolathlon Verified 73.0 59.9 76.5 74.1 72.5 76.2 74.7 74.9