Microsoft backs Anthropic’s lawsuit, urging halt to Pentagon’s supply-chain risk label to protect AI dependencies and innovation.

Microsoft has filed an amicus brief supporting Anthropic’s lawsuit against the U.S. Department of Defense, urging a temporary restraining order to block the Pentagon’s designation of Anthropic as a supply-chain risk. The tech giant argues the designation threatens its own products, which rely on Anthropic’s AI models, and could force widespread system reconfigurations. Microsoft warns the decision could disrupt industry supply chains and hinder AI innovation, highlighting growing tensions between defense officials and private tech firms over national security restrictions on emerging technologies.