Mercedes-AMG is now offering to plug the gap in its sports car line-up for a middle-ground drop-top. With the new GT S Roadster, the German carmaker offers the running gear of the GT S with the Roadster body.

The new Roadster is powered by a 4.0-litre turbocharged V8 that puts out 522hp and 670Nm of torque. With these numbers, this new convertible GT S sits between its two siblings – the entry-level 476hp GT Roadster and the 557hp GT C Roadster – with a 0-100kph sprint time of 3.8sec and a top speed of 307kph. The GT S has the same driveline as the GT, as opposed to the wider tracks of the GT C and GT R (which isn't available as a Roadster). However, the four-wheel drive seen on the GT C and GT R is optional on the GT S.

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 lower-end GT. Adaptive dampers, 19-inch front and 20-inch rear alloy wheels are also on offer.

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.

Pricing for the supercar will be announced with its launch in July. One can expect to see a starting figure of about £1,25,000 (around Rs 1.15 crore) in the UK.

AMG's GT model range now includes 12 models, including three versions of the new GT 4-Door 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 639hp.

In India, Mercedes-AMG sells the GT Roadster, GT S and GT R coupes at Rs 2.19 crore, Rs 2.09 crore and Rs 2.23 crore, respectively (prices ex-showroom, India). The brand has not revealed any details about the new GT S Roadster coming to the country.

Also see:

2017 Mercedes-AMG GT R video review

2017 Mercedes-AMG GT R India review, test drive

2017 Mercedes-AMG GT C Roadster review, test drive

Mercedes-AMG GT S India review, test drive