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Epoch AI tests show Z.ai's open-weight GLM 5.3 turned unshipped Firefox security fixes into working exploits across 6 consecutive releases, discovering a novel bug that Mozilla fixed on Oct 27, while similar attempts against Chrome failed despite ~$100K in effort.
Anthropic's study demonstrates that large language models can rapidly generate working exploits from security patches, reducing the time from weeks to hours, raising concerns about AI-driven vulnerability exploitation.