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CEO Elon Musk said on Wednesday that the automaker is ending production of its Model S and X vehicles, and will use the factory in Fremont, California, to build Optimus humanoid robots.

“It’s time to basically bring the Model S and X programs to an end with an honorable discharge,” Musk said on the company’s fourth-quarter earnings call. “If you’re interested in buying a Model S and X, now would be the time to order it.”

The two models are Tesla’s oldest vehicles, and in recent years the company has slashed prices as global competition for electric vehicles has soared. Tesla started selling the Model S sedan in 2012, and the Model X SUV three years later.

Tesla’s far more popular models are the 3 and Y, which accounted for 97% of the company’s 1.59 million deliveries last year.