On an airstrip somewhere in Texas, a swarm of killer jets approaches--controlled by, of all things, a large language model. At a secret US military base located about 50 miles from the Mexican border--exact location: classified--the defense contractor Anduril is testing a remarkable new use for a large language model. I attended one of the first demonstrations last year. From a sun-bleached landing strip, I watched as four jet aircraft, codenamed Mustang, appeared on the horizon to the west and soared over a desolate landscape of boulders and brush. The prototypes, miniaturized for the demo, fell into formation, their engines buzzing as they grew near.