While we’ve seen spyshots of the Mercedes-AMG GLC 63 previously (with more photos below), this is our first sighting of the SUV’s sleeker-looking sibling – the GLC 63 Coupe. This prototype was snapped by our spy photographers while it underwent winter testing in Sweden, wearing a modest amount of camouflage.

However, it doesn’t do much to hide the obvious AMG visual cues, including the more aggressive-looking front and rear bumpers, with the former having larger air intakes while the latter accommodates the quad-exhaust setup, a trademark of AMG models. Other giveaways include the larger-looking brakes compared with the current GLC Coupe range-topper, GLC 43.

Curiously, the camo applied to the test mule’s front grille is reminiscent of the one we saw on the AMG GT R prototype before its debut. Could this be a sign that AMG models in the future will incorporate the vertical slat design in the future? Currently, AMG models like the GLE 63 and C 63 all feature a single, horizontal slat grille, although the latest E 63 incorporates the vertical look as well.

Visuals aside, the GLC 63 Coupe will likely be powered by the familiar M177 4.0 litre biturbo V8 engine, which is capable of producing 510 hp and 700 Nm of torque in the C 63 S Sedan. An AMG Speedshift MCT seven-speed sports automatic transmission and 4MATIC all-wheel drive will likely be paired with the mill.

Compared to the GLC 43, which packs a 3.0 litre twin-turbo V6 with 367 hp and 520 Nm of torque, the GLC 63 will most definitely make the zero to 100 km/h sprint in less than the GLC 43’s time of 4.9 seconds.

GALLERY: Mercedes-AMG GLC 63 prototypes