Powered by a 515bhp and 494lb ft-producing turbocharged V8, the new convertible GT S sits between the entry-level 469bhp GT Roadster and the 549bhp GT C Roadster.
As such, the performance enabled by the GT S-spec 4.0-litre engine places the car directly between its two siblings, with a 0-62mph sprint time of 3.8sec and a top speed of 191mph.
Like the rest of the GT range, the GT S drives its rear wheels through a seven-speed dual-clutch automatic gearbox. However, it also gets a standard sports exhaust and an electronically controlled limited-slip differential that isn't offered on the lesser GT. Also included are adaptive dampers, along with 19in front and 20in rear alloy wheels.
The GT S has the same driveline as the GT, rather than the wider tracks of the GT C and GT R (which isn't available as a Roadster). However, the four-wheel steering system of the GT C and GT R is an option on the GT S.
In addition, buyers can specify the AMG Dynamic Plus package, which brings firmer suspension, active engine mount and quicker-responding steering. Inside, the pack adds Nappa leather and Dinamica upholstery.
Mercedes-AMG is taking pre-orders for the GT S Roadster now, although it won’t be launched in the UK until July. Prices start from £126,730 - directly in the middle of the GT roadster and more hardcore GT C roadster, and £11,400 more than the GT S coupé. Ceramic brakes are a £5995 option, while the £1695 Driving Assistance package adds blind spot monitoring, lane keep assist and other safety systems.
AMG's GT model range now includes 12 models, including three versions of the new GT 4dr Coupé (which is actually more technically related to the E-Class) and two customer racing models. The range will culminate with a GT Black Series, due in 2020 with an expected power figure of 630bhp.