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Ye-231 (Flogger-A) was the prototype built for testing, and it lacked the sawtooth leading edge that later appeared on all MiG-23/-27 models. This experimental model was the common basic design that both the MiG-23/-27 and Sukhoi Su-24 were based on, but the Su-24 experienced much greater modification.
MiG-23 (Flogger-A) was the pre-production model that lacked the hardpoints on later production versions, but the sawtooth leading edge appeared on this model, and it was also armed with guns. This model marked the divergence of the MiG-23/-27 and Su-24 from their common ancestor.
MiG-23S (Flogger-A) was the initial production variant. Only around 60 were built between 1969 and 1970. These aircraft were used for both flight and operational testing. The MiG-23S had an improved R-27F2-300 turbojet engine with a maximum thrust of 9980 kp. As the Sapfir-23 radar was delayed, the aircraft were installed with the S-21 weapons control system with the RP-22SM radarbasically the same weapons system as in the MiG-21MF/bis. A twin-barreled 23 mm GSh-23L gun with 200 rounds of ammunition was fitted under the fuselage. This variant suffered from various teething problems and was never fielded as an operational fighter.