Cybersecurity agencies from all five Five Eyes nations published a joint statement on Monday warning that frontier AI models capable of “taking down governments and businesses” will arrive within months, according to The Guardian. The coordinated public intervention by signals agencies from Australia, the US, the UK, New Zealand, and Canada marks a significant escalation in how Western intelligence establishments frame advanced AI risk.

“Frontier AI models are anticipated to exceed current industry expectations, fundamentally transforming both offensive and defensive cyber capabilities. The timeline is not years, it is months,” the Five Eyes agencies wrote, as reported by The Guardian.

Context: Anthropic’s Fable 5 Suspension

The statement follows the Trump administration’s June 12 directive ordering Anthropic to suspend all access to its Fable 5 and Mythos 5 models for foreign nationals, citing national security authorities. The directive came just days after Fable 5’s public release, with Anthropic noting the government “did not provide specific details of its national security concern” beyond a verbal description of a potential narrow jailbreak technique, according to Anthropic’s own statement.

The BBC reported that the UK government’s AI Security Institute found Fable 5 could exploit defenses and systems 73% of the time, which Professor Gina Neff of Queen Mary University London called “a step change in capability in cyber security."

"A Core Business Risk”

The Five Eyes statement framed AI risk as no longer a technical issue. “Cyber risk can no longer be treated as a purely technical issue. This is a core business risk and leadership responsibility,” the agencies wrote, calling for “a whole-of-organisation and whole-of-society response,” according to The Guardian.

While no companies or models were named in the statement, the timing directly links it to the Fable 5 controversy. The Guardian noted that “many around the world have their eyes on Anthropic’s advanced tier of tools,” with Fable 5 described as a more community-friendly version of Mythos, an AI model capable of detecting vulnerabilities in cyber systems.

International Fallout

The European Union, which gained access to Mythos earlier in June, said the suspension “further underlined Europe’s need for technological sovereignty,” according to Thomas Regnier, a spokesman for the European Commission, as reported by the BBC.

Olivia Shen, an expert in national security and AI at the University of Sydney’s United States Studies Centre, warned in The Guardian that the visible models may be the least of it. “We can only see what’s been released, but there could be other models being developed by the likes of China, or other states and other actors and companies, that are just as advanced,” Shen said.

Why Five Nations Spoke at Once

Joint public statements from Five Eyes cybersecurity agencies are rare. The alliance typically operates through classified intelligence sharing, not press releases. That all five nations chose to go public simultaneously signals that the intelligence community views advanced AI capabilities as an imminent, coordinated threat requiring civilian awareness, not just government-to-government coordination.

The statement landed the same week Anthropic’s broader legal fight with the US government continues. A US judge has already ruled the Pentagon’s directive designating Anthropic as a “supply chain risk” cannot be enforced while litigation proceeds, according to the BBC. That means government agencies can still use other Anthropic models, but Fable 5 and Mythos 5 remain suspended for all foreign nationals.