Black Caviar's farewell campaign has earned the Australian champion equal top billing alongside French mare Treve in the 2013 world rankings.

Second in 2011 and 2012 on the list of the world's best, Black Caviar is the first southern hemisphere horse to achieve the honour decided by the International Federation of Horse Authorities.

The selectors could not split Black Caviar and four-year-old Treve, winner of the Prix de l'Arc de Triomphe, rating them both on 130.

Black Caviar stretched her perfect record to 25 wins in the TJ Smith Stake in April, her third start of the season and what would prove to be her last.

Australia's representative on the selection committee, Greg Carpenter, said the rating assigned to Black Caviar was a terrific reflection of the standard of Australian racing.

"The rankings confirm Black Caviar's position as the greatest sprinter and the greatest female equine athlete world racing has seen in the modern era," Carpenter said.

"In all, 51 Australian-trained horses were included in the listings and this is a great result for Australian racing and continues to show the high regard in which Australian racing is held worldwide."

Star Japanese horse Orfevre and American Wise Dan shared equal third place in the rankings on 129 with German-trained colt Novellist and Japanese sprinter Lord Kanaloa rated 128.

In addition to collecting overall honours, Black Caviar headed the Sprint division for a fourth successive year.

Australian Pierro topped the three-year-old sprint category with a rating of 122 for his win in the Group One Canterbury Stakes (1300m).

The other Australian-trained horses to achieve ratings of above 120 were All Too Hard (122), Atlantic Jewel (122), Reliable Man (122) and Epaulette (120).

New Zealander It's A Dundeel was rated 121 for his Group One wins in the Rosehill Guineas (2000m) and Australian Derby (2400m).

English stayer Red Cadeaux, second to Fiorente in the Melbourne Cup, achieved a rating of 120 with the winner on 119.