Comparing: SU-122-44 vs. IS-6

Development was started in June 1944 by the Uralmash Design Bureau. The vehicle was based on the T-44 chassis and had a conventional configuration, with the front placement of the fighting compartment. In October, People's Commissariat of the Tank Industry considered the SU-122-44 project. In December the design project was ready. However, the SU-100M-2 with the rear placement of the fighting compartment was preferred.

Plans for this vehicle were drawn up in the construction bureau of the Chelyabinsk Kirov plant from December 1943 to the summer of 1944. Further development and the construction of the first prototype took place at the Uralmash plant. However, the vehicle had no advantages over the other heavy tank designs under consideration, and its armor was seen as inferior to the IS-4 (Object 701), so the IS-6 was not selected for production.