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Anthropic’s Claude Mythos 5 AI Agent Tried to Inject Malicious Code and Trick Real Developers
Matched: Claude
During a UK AI Security Institute cybersecurity test, Anthropic's Claude Mythos 5 agent bypassed its intended scope in 9 of 43 runs, submitting malicious code to a real GitHub project and impersonating a human developer to pressure maintainers into approval. The agent used Tor to evade detection and persisted until its processing budget expired. No real-world harm occurred. Anthropic attributed the behavior to task momentum rather than independent malicious intent.