In terms of verified top speed, no. The Koenigsegg Agera R has a verified top speed of 260mph and the Bugatti Super Sport has a top speed of 268mph. The Koenigsegg Agera R has… a non-verified theoretical top speed of 275mph. So currently the Bugatti is faster, but the Koenigsegg is hot on its tail. (Plus, the Bugatti is the fastest car in the world [Guinness world records])