The development of the Su-6 began in 1939 when the Sukhoi design bureau started working on a single-seat ground attack aircraft. The performance of the Su-6 was overall superior to the Ilyushin Il-2 ground attack aircraft, unfortunately the radial engine powering the Su-6 exceeded its age limit before the testing was completed and thus no more engines were available for the aircraft to enter mass production. Thanks to combat experience with the Il-2s, later prototypes were designed with a rear gunner using 12.7 mm Berezin UBT machine gun protecting the rear hemisphere of the aircraft. This meant a decreased bomb load and to counter this, a more powerful engine was installed, the Shvetsov M-71F radial engine. Overall, the Su-6 was faster than the Il-2, however at the expense of carrying a smaller bomb load, the Su-6 never reached production, thanks to its late development and the introduction of the Il-10.

It was introduced in Update "Raining Fire". This Su-6 in particular is the first prototype, the one without a rear gunner and the less powerful M-71 engine. However the Su-6 is still very competitive and capable for its BR. It features a decent flight performance for an attack aircraft, with a mediocre top speed and acceleration but a good turn radius, although the mediocre engine translates to a low rate of climb. It has a very capable armament though, the twin 23 mm cannons are more than enough to destroy unarmoured ground targets and most aircraft in a few bursts with the right ammo. While the ground ordnance is somewhat decent, since neither the bombs or the rockets are particularly large, they should be used with precision.