Comparing: IS-6 vs. Löwe

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.

Development of this 70-ton super-heavy tank started on November 1, 1941. In February 1942, the Krupp company suggested the VK 70.01 avant project, later designated the Löwe ("Lion"). Several designs varying in configuration, armament, and armor, were drafted. However, the project was canceled after the Führer made the decision to develop even heavier tanks. No prototypes were ever built.