In an attempt to capture a part of the long range, large cabin bizjet market dominated by Gulfstream and Bombardier, the French manufacturer Dassault developed the Falcon 5X. While this failed due to problems with the Silvercrest engine, the re-engined Falcon 6X was certified in 2023. Both models can basically be seen as enlarged Falcon 2000s, as they have the same basic appearance, in particular the cruciform tail, although that of the 5X/6X has horizontal stabilisers with slight dihedral instead of anhedral that was custom so far. The Falcon 5X and 6X have four curved cockpit windows that taper towards the sides. Finally typical are the Falcon 8X type, rather wide and short winglets.

To differentiate between the Falcon 5X and 6X you have to look for detailed differences in the engine nacelles.

Originally, the Falcon 5X was to be powered by two SNECMA Silvercrest engines. The engine nacelles have a rectangular opening on the top side in the middle, and another on the lower side near the intake. They also have large thrust reverser doors with rear edges nearly parallel to the exhaust.

With the failure of the Falcon 5X, Dassault re-designed the aircraft with a Pratt & Whitney engine as the Falcon 6X. This lacks the rectangular openings of the Silvercrest nacelle. While the thrust reverser doors are still quite large, they now have diagonal rear edges. Finally, the 6X is about a foot longer than the 5X, but that is very difficult to spot.