Microsoft backs Anthropic in its legal fight against the Pentagon

"This is not the time to put at risk the very AI ecosystem that the Administration has helped to champion. Immediate implementation of the Determination imposes substantial and wide-ranging costs and risks on Microsoft and other U.S. government contractors that partner with Anthropic and rely on Anthropic's technology as a foundational layer of their own products and services, which they provide to the U.S. military."

"Microsoft warned that the Pentagon's effective blacklisting of Anthropic has negative ramifications for the entire technology sector and American business community. Microsoft's position is that AI should be focused on lawful and appropriately guarded use cases, and AI should not be used to conduct domestic mass surveillance."

Microsoft has publicly backed Anthropic in its legal challenge against Defense Secretary Pete Hegseth's decision to label the company as a supply chain risk. In a filing with a California federal court, Microsoft warned that the Pentagon's effective blacklisting of Anthropic threatens the entire technology sector and American business community. Microsoft has significant financial stakes in Anthropic, having pledged up to $5 billion in investment as part of an expanded partnership. The company argues that implementing the Pentagon's determination would impose substantial costs and risks on U.S. government contractors relying on Anthropic's technology for military applications. Microsoft also echoed concerns about AI safeguards and appropriate use cases.

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