He said the company is moving toward a future centered on autonomous systems and that the Model S and Model X programs will be brought to an end as part of that transition. Model X Development And Production ChallengesThe Model X was first teased in 2012 but did not reach customers until 2015. Shift Toward Lower Cost ModelsTesla has long expected its more affordable vehicles, the Model 3 sedan and Model Y SUV, to significantly outsell the Model S and Model X. Musk previously described the Model S and Model X as niche vehicles. The vehicle has been grouped with the Model S and Model X under an “other models” category in Tesla’s sales reports.