The previous record for a golden wildebeest was set last year at R3,4 million.
The auction attracted 65 buyers who bid on 97 lots.
A black impala ram sold for R325 000, and a roan bull sold for R800 000.
This past weekend, Castle de Wildt hosted the 4th annual Prestige Golden Breeders Game Auction, where a golden wildebeest bull sold for R2,85 million.