The One:1 is based on the Agera R and was presented 2014 at the Geneva Motor Show. It is the first car that has a power to weight ratio of 1hp per kg. The car has 1360hp and is 1360 kg light. The One:1 is more track foucus than the previous Koenigsegg's. And therefor it is equipped with more aggressive aerodynamics. The car was built from 2014 to 2015 and within this period 7 cars including a prototype were built. Koenigsegg claims that this car is the first megacar, because the 1341 bhp power output is the equivalent of one megawatt.
The engine of the car is a 5.0l V8 with 1360hp and a theoretical topspeed of 451km/h (280mph).