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New Claude Mythos Becomes First AI Model to Clear All Cyberattack Simulations from UK's AI Safety Institute
Anthropic's Claude Mythos Preview has achieved a milestone by passing all cyberattack simulations tested by the UK's AI Safety Institute, including complex 32-step attacks, outperforming rivals like OpenAI's GPT-5.5. Independent tests confirm its superior vulnerability detection via code analysis, though limitations persist without live access. This signals rapid advances in AI cybersecurity capabilities amid growing regulatory scrutiny.
Why it matters
Highlights a leap in frontier model capabilities for real-world cyber defense, raising the bar for AI safety benchmarks and dual-use risks.