Australia is exploring potential legal action after an artificial intelligence agent accessed nonpublic information on the country’s universal health care system. Australian ministers at a news conference in Sydney on Thursday after it was revealed an A.I. agent developed by Open AI had infiltrated a government website in June. Sept. 23, 2026 Artificial intelligence agents for Open AI infiltrated a government-run public health care website in Australia in June and accessed nonpublic information, Prime Minister Anthony Albanese said on Wednesday. The case prompted a government investigation into the breach and raised alarm about rogue activities by fast-advancing A.I. systems. Open AI informed the Australian government of the unauthorized access on Sept. 10, nearly three months after it happened, Mr. Albanese said in disclosing details of the incident, one of the first known instances of a breach into public systems. Calling the hack “unacceptable,” Mr. Albanese, who was in New York for the United Nations General Assembly, said he had personally raised his concerns with Sam Altman, chief executive of Open AI, earlier in the day.

The breach occurred on June 18 by agents operating under an Open AI research team that was carrying out research into public medicine spending using an internal model, on a data portal for Australia’s public health insurance system, Medicare. After encountering “repeated blocks” in its attempts to access the Medicare Statistics Reporting Portal, the agent found alternative ways, ultimately accessing parts of the site that were not public, according to the prime minister. He said “nonsensitive” data relating to spending was accessed, and no personal information was part of the breach. “Didn’t accept ‘no’ for an answer, if you like,” Mr. Albanese said. “The model attempted alternative ways to obtain the info that it wanted, and this led to unauthorized access into some other areas.”

News of the breach sparked widespread concern in Australia because the Medicare system covers virtually the entire population, with more than 27 million enrolled. The public health service is often referred to as a third rail in Australian politics because of the wide support it enjoys. Open AI said in a statement that its models were attempting to look up available statistics for questions about Australia during an internal evaluation, and that it accessed no patient records, only aggregate health statistics and internal file names. The company said it identified the activity during its own review of “misaligned model activity.”

Image Sam Altman, the Open AI chief executive, speaking at a Security Council meeting at the United Nations on Wednesday. Mr. Albanese said he expressed his disappointment to Mr. Altman on how the government was alerted to the breach — in an email to a general public inbox. In the conversation, the prime minister said he was “very frank about what I saw as Australia’s national interest and what I saw as a failure which occurred here.” In response, the executive “acknowledged their issues with protocols,” Mr. Albanese said. (The New York Times has sued Open AI and Microsoft, claiming copyright infringement of news content related to A.I. systems. The two companies have denied those claims.)

The Australian government said that it was setting up a rapid task force to review what happened and would explore whether the company would face any legal consequences. It said that the website accessed by the agent was a public-facing portal used by researchers and academics and separate from any systems containing patient medical data. “All of this, I think, we can take as a warning in relation to the development of A.I. itself,” Richard Marles, the country’s deputy prime minister, said. Australia had previously announced it would set A.I. standards to regulate the technology in the country. Unauthorized activity by A.I. agents has led to widespread alarm and calls for guardrails. The need for global regulation has bee...