Elon Musk arrives at the U.S. District Court in Oakland, Calif., Tuesday, April 28, 2026. Godofredo A. Vásquez/AP hide caption

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Godofredo A. Vásquez/AP

Elon Musk, of Tesla, SpaceX and DOGE fame, said in court on Wednesday he was "a fool" for putting money into the artificial intelligence company OpenAI, which started off as a nonprofit but later created a for-profit arm.

Musk is suing OpenAI, CEO Sam Altman and others, claiming, as his attorney put it, that they " stole a charity ." OpenAI was founded in 2015 as a nonprofit to develop AI for the benefit of humanity.…