GMC Sierra 1500 (2017) is 981 mm (38.62 inch) longer, 257 mm (10.12 inch) wider, 582 mm (22.91 inch) higher and has 1485 liters (52.44 ft3) bigger cargo space than Toyota GT86 (2021).
Toyota GT86 (2021) is 775 kg (1,709 lbs) lighter than GMC Sierra 1500 (2017).