German insurance company HUK24 has done it again. Following the unexpected reveal that there would be a Mercedes-AMG A 45 S on the way, a new document hints at another model in the company’s pipeline, the GT R Roadster.

Of course, an open-top version of the GT R isn’t that big of a surprise as our spy photographers have already spotted a prototype making the rounds. Based on the document, the roadster will use the same handbuilt 4.0 litre V8 biturbo M178 engine as the normal GT R with 585 PS and 700 Nm of torque.

Expect performance figures to not detract that much from the hardtop, which is capable of completing the zero to 100 km/h sprint in 3.6 seconds, and has a top speed of 318 km/h.

Other performance-related bits include adjustable coilover suspension, a rear-wheel steering system, limited-slip differential and a tweaked aerodynamic package. Visually, the GT R Roadster doesn’t differ that much from its hardtop sibling, with the folding soft top being the notable revision. The test mule seen here isn’t fitted with new headlamps that are present on the facelifted models.

With the addition of the GT R Roadster, which will likely debut at this year’s Geneva Motor Show, the Mercedes-AMG GT range will feature eight variants.