 The Model X was developed from the full-sized sedan platform of the Tesla Model S. The Model X has an EPA Size Class as an SUV, and shares ~30% of its content with the Model S, half of the originally planned ~60%, and weighs about 10 percent more.Both the Model X and Model S are being produced at the Tesla Factory in Fremont, California.The prototype was unveiled at Tesla's design studios in Hawthorne, California on February 9, 2012.