Elon Musk made a big announcement about Tesla on Wednesday, saying in an earnings call that the company would be ending production of its Model S and Model X, and converting the Fremont factory to production of the Optimus robot. "It’s time to basically bring the Model S and X programs to an end with an honorable discharge,” Musk said during Tesla's Q4 earnings call. “So if you’re interested in buying a Model S and X, now would be the time to order it." As CNBC notes, the Model S, which began production in 2012, and the Model X, are Tesla's second- and third-oldest models, after the original Roadster. And Musk said Wednesday that the final versions of both models X and S would be produced in the upcoming quarter.