Production in bulk of the IS series started in February 1944 and ended nearing the end of World War II. The first few KV-85 tanks were produced in 1943 as a stopgap while the IS-1's development cycle was wrapped up. The 1944 model was produced with a revised front slope that was better from an armor point of view while still saving weight. The IS-122 was renamed to IS-2 and production started with the 1943 model using a KV-13 chassis. The IS-122 was found to be better in trials, and the IS-100 was dropped. In December 1943, the IS-85 was up gunned with the 100mm BS-3 gun, creating the IS-100, and the IS-122, armed with the A19 gun (later adopted and renamed as the D-25T). The IS-85 was soon finished and it combined the hull of the KV-13, and the new turret from the KV-85, and the same D-5T gun as both tanks. The tank was a result of the USSR's tank design bureau being torn in two, one half focusing on the KV-85 and its variants, and the other working on the later IS series.
The KV-85 heavy tank was a modification of the KV-1S heavy tank.
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