The UK's AI Security Institute (AISI) officially confirmed that Anthropic's unreleased "Claude Mythos Preview" is the first AI model in history to successfully complete a highly complex, end-to-end cyber range evaluation.

The evaluation simulated a full-scale corporate network attack. The model autonomously executed a 32-step penetration test spanning from initial network reconnaissance all the way to a complete system takeover.

According to AISI, this exact operation would typically take a human cybersecurity expert roughly 20 hours to execute.

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