Microsoft Seeks Urgent Court Action to Shield $5 Billion Anthropic AI Investment from Pentagon Risk Classification

Microsoft has launched emergency legal action to block a Pentagon decision that could trigger a major disruption in military AI access and jeopardize billions in private tech investments. The tech giant warns that abruptly classifying AI firm Anthropic as a supply-chain risk—just weeks after Microsoft committed up to $5 billion to the company—threatens to sever critical government contracts and undermine America's competitive edge in advanced artificial intelligence systems.

Pentagon labels Anthropic a supply-chain risk

The controversy erupted last week when the Pentagon formally barred Anthropic’s technology from defense contracts, and it designated the company a supply-chain risk. 

This label has traditionally been associated with companies tied to foreign adversaries. Such contractors working with the Defense Department under the order must certify that Anthropic’s AI models are not used in systems or services linked to Pentagon work. 

Anthropic quickly sued the department over its decision, alleging that the designation was both unprecedented and unlawful, and charging the federal government. The company said the ruling could damage its business significantly and threaten contracts worth hundreds of millions. 

The debate centers around Anthropic’s AI models, called Claude. The company had been negotiating with the Pentagon regarding how the technology would be used, but the talks broke down. Anthropic wanted assurances that its systems would not be used to conduct fully autonomous weapons or for mass domestic surveillance. 

As the situation unfolds in the US, Anthropic is planning to open a new office in Sydney in the coming weeks as it expands its presence in Australia and New Zealand. According to the company’s Economic Index, the two countries rank fourth and eighth globally in per capita Claude.ai usage. The Sydney office will become Anthropic’s fourth hub in the Asia-Pacific region. 

Tech workers and AI researchers back Anthropic

The controversy has also drawn support for Anthropic from across the artificial intelligence community. More than 30 employees from OpenAI and Google DeepMind filed a statement supporting Anthropic’s lawsuit. Among the signatories was DeepMind’s chief scientist, Jeff Dean.

In the court filing, the researchers argued that the government’s designation was an arbitrary use of power that could harm the broader AI industry.

They noted that if the Pentagon was dissatisfied with its contract with Anthropic, it could simply have ended the agreement and chosen another provider instead of labeling the company a supply-chain threat.

The employees also warned that the move could undermine US competitiveness in artificial intelligence by discouraging open discussion of the technology’s risks and limits.

Shortly after the Pentagon announced the designation, the Defense Department signed a deal with OpenAI, a development that some OpenAI employees reportedly protested.

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