The Koenigsegg One:1 was presented at the 2014 Geneva Motor Show held in March. Koenigsegg built six cars apart from the car presented at the Geneva Motor Show. All of which were already sold. Koenigsegg took two cars to the 2014 Goodwood Festival of Speed, where they were displayed alongside other sports cars such as the McLaren P1, the Ferrari LaFerrari, the Porsche 918 Spyder and the Pagani Huayra.
The car is fitted with a variant of the same 5.0 L twin-turbocharged V8 engine used in the other Agera variants. It generates a maximum power output of 1,360 PS (1,000 kW; 1,341 hp) at 7,500 rpm and 1,371 N⋅m (1,011 lb⋅ft) of torque at 6,000 rpm. The transmission is a 7-speed dual clutch paddle shift as used in other variants of the Agera.