Koenigsegg One:1

The One:1 was Koenigsegg's top-range model in the Agera model line, with the clear goal of being the fastest car around the track and in speed, with a top speed of 273 mph (440 km/h) even while having among the sharpest cornering forces of any road car. The One:1's name is derived from its equal ratio of metric horsepower (PS) to kilogram weight (kg), leading it to become known as the first "megacar".

It is also one of the most exclusive hypercars ever made, with only seven units made, including a prototype, each priced at over US$2.4 million.