Anthropic says China’s GLM-5.3 nearly matches Mythos at cyber exploits
GLM-5.3, an open-weight model from the Chinese lab Zhipu AI, can build working cyber exploits on its own almost as well as Claude Mythos Preview, Anthropic said on Tuesday. Its safeguards can be bypassed with simple techniques in up to 100% of tests.
Anthropic’s Frontier Red Team published the findings in a research post. Zhipu is known outside China as Z.ai. Five months ago, Anthropic released Mythos Preview only to vetted cyber defenders, through Project Glasswing, because of its hacking abilities. Anyone can download GLM-5.3.
“The release of GLM-5.3 is a meaningful step change in the cyber capabilities available to attackers,” Anthropic wrote.
50 working exploits in 410 attempts
On ExploitBench, which tests exploits of known flaws in the V8 engine used by Google Chrome, GLM-5.3 built end-to-end exploits in 50 of 410 attempts. Mythos Preview did so in 56. On Anthropic’s internal Binary Exploitation benchmark, GLM-5.3 achieved a...
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