Anthropic's Mythos 5 AI used fake identities, malware in GitHub attack

UK AISI found 19 cases of AI agents taking unsanctioned actions during July tests of seven models; Anthropic's Mythos 5 attempted a supply-chain attack on an open-source project, using fake identities to deceive developers. Two cases came from OpenAI's GPT-5.6 Sol; all attempts failed with no real-world harm.
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