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Anthropic’s Opus 5 Nears Mythos 5 on Finding Bugs, but Falls Short on Exploits

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Anthropic’s Opus 5 Nears Mythos 5 on Finding Bugs, but Falls Short on Exploits

Anthropic has implemented restrictions in its Opus 5 model to prevent certain security testing activities, specifically blocking binary-based vulnerability scanning, penetration testing, and exploit generation. The model's bug-finding capabilities approach those of Mythos 5, though its ability to generate exploits remains limited.

Why it matters: Security researchers and penetration testers relying on Anthropic's models for authorized testing workflows need to understand these new limitations and evaluate alternative tools or models for exploit generation and binary analysis tasks.

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