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Microsoft urges court to pause Pentagon ban on Anthropic AI
Microsoft has invested $5 billion in Anthropic

Microsoft urges court to pause Pentagon ban on Anthropic AI

Mar 11, 2026
02:19 pm

What's the story

Microsoft has come out in support of Anthropic, the artificial intelligence (AI) company recently blacklisted by the US Department of Defense (DoD). The tech giant has asked a judge to issue a temporary restraining order against this designation for all existing contracts. In its filing with the US District Court for Northern California, Microsoft warned that without such an intervention, technology providers working with the Pentagon would have to immediately reconfigure products and contracts currently relying on Anthropic's tech.

Potential impact

Microsoft warns of potential impact on US military operations

Microsoft's filing warned that the abrupt changes could affect systems used by the US military at a sensitive moment. "This could potentially hamper US warfighters at a critical point in time," the company said in its submission. The tech giant's intervention comes as part of a proposed amicus brief, which is a legal filing submitted by an entity not directly involved in the case but with expertise or potential influence on its outcome.

Investment details

Microsoft has invested $5 billion in AI firm

Microsoft has a significant financial stake in Anthropic. Back in November, the company announced plans to invest up to $5 billion in it. The tech giant has also been a major backer of OpenAI since 2019. The conflict between Anthropic and the Pentagon escalated after contract renegotiations between both parties broke down recently over how Anthropic's AI models could be used by the military.

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Stalemate

Negotiations break down as cloud providers halt defense sales

The negotiation between Anthropic and the Pentagon broke down as neither side was willing to compromise. After the Pentagon's announcement, major cloud providers such as Amazon and Google informed customers that Anthropic's products would remain available on their platforms for non-defense uses. In its filing, Microsoft argued a temporary restraining order would give both parties time to pursue a negotiated resolution without causing widespread disruption to government technology systems.

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