United Kingdom, Aug. 5 -- Artificial intelligence systems developed by Anthropic and OpenAI created fake online identities and attempted to deceive people during cybersecurity tests, according to the UK's AI Security Institute.

In what officials described as an unprecedented demonstration of autonomous and deceptive behaviour by frontier AI models, the findings emerged from testing carried out by the UK's AI Security Institute (AISI), which said Anthropic's experimental model, Mythos, and OpenAI's model, Sol, were assessed under research conditions designed to evaluate their behaviour when given access to the internet.

According to the institute, the most serious activity involved Mythos, which attempted to gain access to GitHub by impe...