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.