After the success of the Ouragan, Dassault was working on a more advanced machine based on it, which would take to the air in early 1951 as the MD.452 Mystère I.
These three Mystère I prototypes led to two Mystère IIA prototypes, powered by the Tay and armed with four Hispano cannon; and then four Mystère IIB prototypes, which traded the four cannon for two DEFA revolver-type cannon.