The US has officially deemed artificial intelligence (AI) firm Anthropic a supply chain risk — the first time the government has given that label to a US firm.

The Pentagon's designation is the latest escalation in a clash over Anthropic's refusal to give the government unfettered access to its AI tools over concerns they would be used for mass surveillance and autonomous weapons.

In a statement, a senior Pentagon official said the supply chain risk designation was "effective immediately."

Anthropic has previously said it would sue the Pentagon over such a designation.

The AI developer had been in talks with the Department of Defense in recent days, even after their negotiations spilled into public view last week, sources familiar with discussions have told the BBC.