Microsoft backs AI firm Anthropic in legal battle against Pentagon

The Guardian US News
by Joseph Gedeon in Washington
March 12, 2026
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2 min read

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Microsoft is supporting AI firm Anthropic in a legal challenge against the Pentagon's designation.

AI Summary

Microsoft filed an amicus brief in support of AI firm Anthropic's legal challenge against the Pentagon in a federal court in San Francisco this week. This brief supports Anthropic's effort to overturn a Pentagon designation that effectively bars it from government work. Microsoft argued a temporary restraining order is necessary to prevent serious disruption to suppliers whose products rely on Anthropic's technology. This action supports Anthropic, whose AI tools are integrated into systems Microsoft provides to the US military.

What's Being Done

Microsoft filed an amicus brief supporting Anthropic's legal challenge against the Pentagon in federal court.

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