The US Department of Defense has stopped using Anthropic's AI tools, an official told the BBC, months after designating the company a "supply chain risk" on national security grounds. Defence Secretary Pete Hegseth had labeled Anthropic a risk in February and announced a phase-out by late August. However, multiple sources familiar with the matter told the BBC that Anthropic's Claude model was still widely used by the department as recently as last week in research, analysis, intelligence gathering, and military operations against Iran. The Pentagon has since signed contracts with other major tech companies including Google, xAI, and OpenAI.