"Big Short" investor Michael Burry criticized Palantir (PLTR) in a public exchange with Elon Musk, arguing the company is "overpromising" on AI. Burry stated Palantir relies on models built by firms like Anthropic and lacks its own AI software. Musk had questioned Anthropic's hypocrisy, but Burry defended the AI firm. PLTR shares fell slightly in extended trading.