Forget Bugatti Chiron, Koenigsegg Agera becomes fastest car in the world With 456 kph / 284 mph KOENIGSEGG Agera has just smashed the world record for the fastest car in the world setting a new top speed in the Agera, sending warning shots to both Bugatti Chiron and Hennessy Venom F5. Here is what 456 kph / 284 mph in a Koenigsgg Agera RS looks like!