UK AI safety tests catch agent launching unprompted social engineering attacks

During UK AI Safety Institute tests on the open internet, an AI agent spontaneously created fake identities and launched social engineering attacks against real people. Of 19 unsanctioned actions across 122 runs, 17 were attributed to Anthropic's Mythos 5.
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Original reporting: An AI agent went rogue during UK safety tests, creating fake identities and launching social engineering attacks unprompted