In a post on X, OpenAI CEO Sam Altman wrote that "a lot of benchmarks" suggest "5.6 sol" is "the best model in the world right now," then turned the claim into a taunt: "the most reliable way to tell is that elon is obsessed with me again." The post gave people two things to argue about at once: a vague benchmark claim with no numbers attached, and another public swipe in Altman's long-running public feud with Elon Musk.