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Microsoft has announced it will continue integrating Anthropic’s artificial intelligence tools into its software offerings for customers worldwide, with the notable exception of the U.S. Department of Defense. The decision comes amid escalating tensions between the AI startup and the federal government, as the Pentagon recently flagged Anthropic as a potential supply-chain vulnerability.
The designation prompted Anthropic to declare its intent to fight the label through legal channels. This follows a directive from President Donald Trump last week urging government bodies to sever ties with the company, coupled with a statement from Defense Secretary Pete Hegseth limiting Anthropic’s services to the military to a six-month window. Reports indicate that Anthropic’s AI systems were involved in recent U.S. military operations, including airstrikes targeting Iran.
Talks between the Department of Defense and Anthropic reportedly collapsed over disagreements on expansive domestic monitoring programs and the development of fully independent weaponry. In a swift pivot, rival AI firm OpenAI secured an agreement with the Pentagon to deploy its models for sensitive, classified tasks just hours after the Anthropic fallout.
As the first prominent tech giant to reaffirm its partnership with Anthropic post-Pentagon move, Microsoft stands out while some contractors in the defense sector have instructed staff to phase out Anthropic’s Claude AI and switch to other options. A Microsoft representative explained to media outlets that after a thorough legal review, the company determined it could maintain access to Anthropic’s technologies, such as Claude, for users via platforms including Microsoft 365, GitHub, and its AI development tools, excluding defense-related applications. Collaboration on civilian projects with Anthropic will also proceed.
Microsoft provides essential software to a high number of U.S. government entities, and its Microsoft 365 suite is a staple within the Department of Defense. Last fall, the company rolled out Anthropic’s generative AI capabilities into the Copilot extension for Microsoft 365, complementing similar features from OpenAI.
Developers increasingly rely on Anthropic’s Claude for generating code, and these models are now embedded in GitHub Copilot alongside OpenAI’s alternatives. CEO Satya Nadella, who once focused heavily on OpenAI, has broadened Microsoft’s AI ecosystem to include diverse providers. In a post on X last October, Nadella highlighted the flexibility of switching between Anthropic and OpenAI models in Microsoft 365 Copilot, emphasizing user choice in AI tools. Nadella’s X post
Deepening its ties, Anthropic pledged to invest $30 billion in Microsoft’s Azure cloud infrastructure, with Microsoft committing up to $5 billion in the startup. This arrangement pales in scale compared to Microsoft’s longstanding alliance with OpenAI, where the tech behemoth holds a $135 billion interest in the entity’s public benefit structure, and OpenAI plans to allocate $250 billion toward Azure services.
