GMC’s largest SUV receives a mid-cycle update for 2025 including new technologies, bolder aesthetics and an updated interior complete with a 16.8-inch touchscreen in a vertical layout. The brand also introduces the new AT4 Ultimate model which focuses on off-road capability. Under the hood, the 5.3-litre V8 (355 horsepower) can be replaced by a 6.2-litre V8 (420 horsepower) or a 3.0-litre six-cylinder turbo-diesel (305 horsepower).