In 2025, the A.I. frontier lab Anthropic mustered Claude, its large language model, for national service. Although the military-industrial complex is newly fashionable, Anthropic was not a natural fit. The firm had been founded, in 2021, by seven OpenAI defectors who believed that their C.E.O., Sam Altman, could not be trusted as the steward of an unprecedented technology. Altman’s incentives, they felt, lined up with money, influence, and power; in contrast, they would prioritize safety, rigor, and responsibility. The company’s C.E.O., Dario Amodei, was a bespectacled manifestation of the company’s heady, neurotic, moralizing culture, and jingoism wasn’t part of Claude’s...