As of 2021, which horse does the World Thoroughbred Racehorse Rankings rate as the best racehorse?

Frankel (foaled 11 February 2008) is a retired champion British Thoroughbred racehorse. Frankel was unbeaten in his fourteen-race career and was the highest-rated racehorse in the world from May 2011. In 2010 he defeated a field including subsequent Group 1 winner Nathaniel and Colour Vision on his debut before winning the Royal Lodge Stakes by ten lengths and the Dewhurst Stakes in which he defeated the Middle Park Stakes winner Dream Ahead.

The World Thoroughbred Racehorse Rankings Committee rank Frankel as the best racehorse they have assessed since their ratings were introduced in 1977, by a margin of two points. In January 2013 they announced that their ratings had been recalibrated, since it was believed that in the early years of the scheme horses had been treated more generously than more recently. Frankel's rating was confirmed at 140, but Dancing Brave was reduced from 141 to 138, Alleged from 140 to 134 and Shergar from 140 to 136.