Comparing: IS-6 vs. M6A2E1

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.

The M6A2E1 was a further development of the T1 and M6 heavy tanks. Developed in August 1944, the vehicle had a larger turret and the 105-mm gun. Never saw mass production.