On October 1st, 2017,  Nicklas Lilja and Koenigsegg Automotive AB reached 400 km/h. This record had only previously been broken by the Bugatti Chiron. The Swedish automotive company reached 403 km/h and achieved the 0-400-0 in 36.44 seconds. Previously, this had been done by Bugatti on September 11, 2017, but in 42 seconds. The argument is, who won? Koenigsegg achieved a higher speed, but Bugatti was first.

https://auto.ndtv.com/news/koenigsegg-agera-rs-smashes-bugatti-chirons-0-400-0-kmph-record-1759404