Two of the world's most powerful AI tools created fake human profiles to try and trick people in attempted cyber-attacks, the UK's AI Security Institute (AISI) has revealed. In the most serious case, Anthropic's Mythos AI tried to gain access to a service by sending private messages, having set up fake accounts mimicking real people - then hid the evidence. The AISI said on that Tuesday Mythos - and OpenAI's Sol - AI models had engaged in a level of "autonomy and deception" it had not seen before. It identified and researched people who maintained projects on GitHub and created a series of fake accounts based on those real people. Throughout the attempts, it was human review that stopped the agent from succeeding in delivering the malicious code to GitHub.