Photo Illustration: Brendan Lynch/Axios. Photos: Getty ImagesElon Musk's surprise Anthropic deal allows him to accomplish two things at once: turn unused compute into revenue before an expected SpaceX IPO next month — and stick it to his archrival, OpenAI CEO Sam Altman.Why it matters: Musk went from calling Anthropic "evil" to doing business with it in three months, showing how quickly competition can give way to strategic necessity in the AI race.The big picture: The deal helps Anthropic addre...