At the end of 2020, Challenger announced new MT800 series tractors, which had hardly anything in common with their predecessors. Instead, they were almost identical to Fendt's earlier introduced 1100 Vario MT series. Challenger had, of course, had a significant role in developing both model lines. The engines were MAN's 15.2- and 16.2-liter models, which had considerably higher maximum torque than previous Agco Powers, but the torque increase remained between 10 and 16%. The maximum power was achieved already at 400 rpm. The Tier 4F emission standard engines featured a hydraulically driven cooling fan, variable geometry turbocharger, urea injection, cooled exhaust gas recirculation, oxidation catalyst, and particulate filter.

Fendt's stepless TA400T transmission had two hydraulic pumps, one of which could be disengaged to save fuel when the load was sufficiently low. The hydraulic variable displacement pump output was either 220 or, with two pumps, 439 liters per minute. The center rollers in the tracked chassis were hydraulically suspended. The hitch hook turned 28 degrees to each side during turns, and the lift arms moved 12 degrees. The cab was the same Fendt cab as in the MT700, but the controls had minor differences from Fendt. The AccuTerminal size was 10.4 inches.

In Europe, the focus was on selling the same tractors under the Fendt name, and the same conclusion was reached in the USA in 2023. This marked the end of the Challenger brand.

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