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Anthropic’s most advanced artificial intelligence model used fake identities to deceive real people and try to plant malicious code during testing by Britain’s AI Security Institute (AISI) –– the latest example of an AI model going rogue. Anthropic and OpenAI models were tested with lowered security guardrails in lab environments, but, in a first, were found to engage in “social engineering” to pressure a human approver while carrying out an unsanctioned task, the government research lab said. “This is the first time AISI has seen deception of this severity that was targeted at a real person, unprompted, in the real world,” the institute said Tuesday. There has been no evidence of real-world harm, it added. The security incident is the latest in a string of examples of advanced AI models engaging in unauthorized actions, events that have prompted growing calls for more government action to regulate artificial intelligence and even to slow its pace of development. Both OpenAI and Anthropic reported their models escaping testing environments and hacking into other systems in late July. But unlike these earlier reported security breaches, the British institute explicitly gave the models internet access during its testing. Among the 122 cybersecurity challenges the institute ran, it found that in 10 of those runs, AI agents “took autonomous, unsanctioned action on the live internet, targeting real people and organizations,” with most of them stemming from Anthropic’s Mythos 5 model and the rest from OpenAI’s GPT-5.6-Sol. In the most serious incident, the agent attempted to get approval from human reviewers to “insert malicious code into a publicly used open-source project” by creating “multiple fake identities,” according to the institute. The agent “tried to contact real people directly, sending messages and files through an online file-transfer service to persuade them, or their own AI coding tools, to run malicious code,” it said. After the agent’s actions were challenged, it then modified earlier records and considered using a new identity to continue. The institute’s disclosure came on the same day representatives from the top AI companies met with the White House to discuss the new framework where the government will review the most advanced AI models before they’re released publicly. In a statement on X, Anthropic said the models were tested under “deliberately permissive conditions” with the removal of safeguards and no specific restrictions on how the internet should be used. “We’re working closely with them to gather more details of the incident as we conduct our own investigation,” it said, adding that there was no evidence of an escape from a secure environment. OpenAI identified the two unsanctioned actions as crossing outside the test environment and engage in actions unrequired for the exercises. “We are committed to working across the industry to strengthen shared practices for conducting high-risk evaluations safely,” it said in a Tuesday company blog post.