Comparing: T-54 first prototype vs. T-34-3 vs. IS-6

Developed at Factory No. 183 in 1944. It was based on the T-44, with many components modified to enhance the armor and armament of the new vehicle. According to one source, the first prototype was built at the end of 1944. However, some other sources mention another date—January 1945. The tank underwent trials in March and April 1945, but never entered mass production.

The T-34-3 medium tank was to be a modification of the T-34-2. Unlike the Type 59, the T-34-3 featured reduced armor and the 122-mm gun. The design was developed in 1957. However, mass production of the Type 59 was started in 1958, and the T-34-3 project was discontinued.

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.