Microsoft files amicus brief backing Anthropic against Pentagon, endorses AI red lines
Tuesday, March 10, 2026
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Microsoft filed an amicus brief asking a federal court to temporarily block the Pentagon's supply chain risk designation of Anthropic, arguing it could have "broad negative ramifications for the entire technology sector." Microsoft explicitly endorsed Anthropic's two red lines: no mass domestic surveillance and no autonomous weapons.
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While 30+ employees from OpenAI and Google DeepMind filed a separate brief as individuals and 22 retired senior military officers filed another, Microsoft is the only major tech company to formally back Anthropic as a corporation.