GPT-5.4-Cyber and Mythos Are Here. Who Governs the Defenders' AI Agents?
GPT-5.4-Cyber and Mythos Are Here. Who Governs the Defenders' AI Agents? In the span of eight days, both frontier AI labs released cyber-specific models. On April 7, Anthropic announced Claude Mythos Preview — a model that found zero-day vulnerabilities in every major operating system and browser. It chained four vulnerabilities into a browser exploit, wrote a 20-gadget ROP chain for FreeBSD remote code execution, and discovered a 27-year-old bug in OpenBSD. Anthropic restricted access to roug...
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