Aug 14 2026

Z.ai releases GLM-5.3, claiming its cybersecurity capability outgrew training and found 2,436 real vulnerabilities, with open weights held back two weeks.

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Same 743B base as GLM-5.2, all gains from . Z.ai reports CyberGym 84.5, edging its reading of Mythos 5 and GPT-5.6 Sol; all figures are the company's own. Lands four days after OpenAI's Astra cyber-threshold caution.

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