An AI model developed by Anthropic has identified vulnerabilities in highly sensitive US government computer systems during a testing exercise, a US official told the Associated Press.

The official, who spoke on condition of anonymity, said Anthropic had teamed up with US intelligence agencies to conduct the tests using the company's Mythos model.

It identified certain vulnerabilities within hours, though that did not mean the model was able to exploit them within that time, the official said.

The testing was carried out through an Anthropic initiative called Project Glasswing, which brought together technology companies in a bid to secure critical software from the "severe" fallout that Mythos could pose to public safety, national security and the economy.

Democratic Senator Mark Warner of Virginia had briefly mentioned the testing during a 11 June hearing before the Senate Committee on Banking, Housing, and Urban Affairs.