NSTHA and IIHS have different ways of rating cars. The best would be to top the leaderboards for both agencies, but Model S being first place and Model X being second place ain't no easy task though. Tesla has since addressed the issue since that test, so whenever they have another Tesla to test, it will reflect in that score.

I'm wondering if anyone knows a link to the leaderboard that Tesla mentions that the S and the X are the top two vehicles