Five Eyes Alliance: Threats from Frontier AI Models Only Months Away

The Five Eyes security agencies warn that frontier AI models (e.g., Anthropic’s Mythos/Fable 5 and OpenAI’s GPT-5.5) will rapidly accelerate cyber threats—potentially in months—not years. They urge organizations to reduce attack surface, accelerate patching, retire legacy systems, strengthen identity/access controls, and integrate AI defensively; the report cites Mythos’ capability to both find vulnerabilities and generate exploits, a red-team breach demonstration, and related government restrictions.