Tesla Chief Executive Elon Musk confirmed the deal on X, saying Samsung’s new facilities in Texas will be dedicated to making the U.S. electric-vehicle company’s next-generation AI6 chip.

Samsung Electronics (005930.KS) said on Monday it has signed a contract valued at $16.5 billion to supply semiconductors to a major global corporation, in a regulatory filing.

Samsung’s filing includes a notice to investors that the deal could be canceled or changed, but details like where the chips will be made (how’s that Texas plant going?) or what they’ll do are all un...