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Anthropic says Zhipu's open-weight GLM-5.3 nearly matches Claude Mythos Preview at building exploits
The Decoder·September 30, 2026·1 min read
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Zhipu's open-weight model GLM-5. 3 writes cyber exploits nearly as well as Claude Mythos Preview, according to Anthropic.
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Zhipu's open-weight model GLM-5.3 writes cyber exploits nearly as well as Claude Mythos Preview, according to Anthropic. Its smaller Flash variant put together a reliable Chrome attack for just $20.40 at Zhipu's API prices. The model's safeguards are easy to strip out, and unlocked versions are already circulating. Anthropic has its own reasons to sound the alarm, but the US agency CAISI backs up the findings. The article Anthropic says Zhipu's open-weight GLM-5.3 nearly matches Claude Mythos Pr
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