Aug 28 2026

Z.ai released GLM-5.3's open weights on Hugging Face, two weeks after flagging the model's cyber capability outran its own safety testing.

OPENMODEL

Original reporting

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Downloadable in Safetensors, BF16 and under Z.ai's own glm-5.3 license, gating offensive-security use behind a separate verification step while shipping defensive use unrestricted.

Named in this event

Z.ai

Open calls that touch this

Z.ai releases GLM-5.3's open weights by August 31st · 65%, resolves August 31st 2026
A second flagship API adopts time-of-day pricing · 55%, resolves February 17th 2027

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