Z.ai GLM 5.3: Benchmarks, API, Open Weights — Alex Getman

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Alex Getman @alexgetmancom · 14 Aug 2026, 08:47 UTC · Updated 31 Oct 2026, 20:59 UTC

⚡️ Z.ai released GLM 5.3

The new model is noticeably stronger than GLM 5.2 in coding, agents, and cybersecurity. Across benchmarks, GLM 5.3 is already very close to GPT 5.6 Sol. API pricing isn’t public yet, but I’m pretty sure it’ll be at least 2 to 3x cheaper than Sol.

Open weights are coming in 2 weeks.

Screenshot of LLM performance evaluation chart: GLM-5.3 (blue) outperforms GLM-5.2, Kimi K3, Mythos/Fable 5, and GPT-5.6 Sol across benchmarks including Terminal Bench 3.0, DeepSWE, AutomationBench, HLE w/ Tools, GDPVal-AA v2, CyberGym, ExploitBench, and ExploitGym.

GPT-5.6 Sol Z.ai GLM

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