Claude Fable 5 can find your vulnerabilities. What authorizes its next move?

Anthropic has released Claude Fable 5 and Claude Mythos 5, with the latter claiming to have unparalleled cybersecurity capabilities while the former is designed for general use with added safeguards. The availability of vulnerability discovery via API, once a domain requiring deep expertise, poses both an opportunity and a challenge as AI-generated code often introduces security vulnerabilities, with studies indicating AI can increase confidence without a parallel rise in competence. Anthropic's models employ classifiers to filter offensive security requests, but these safeguards are not foolproof, with significant false-negative rates observed in real-world stress tests. The text underscores the necessity for deterministic, rather than probabilistic, security measures within AI systems, advocating for a robust in-loop position enforcement to ensure comprehensive policy checks on all agent actions. It highlights the importance of established security principles such as least privilege and deny-by-default policies, and presents Ory Agent Security as a solution that ensures authenticated, authorized, and accountable agent actions through deterministic policy enforcement, offering integration with several agentic coding tools.

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