Answer
Joshua Cheptegei set the 5000m world record of 12:35.36 on October 7, 2020, breaking the previous record set by Kenenisa Bekele in 2004. Bekele's record had stood for 16 years and was considered to be one of the most unbreakable records in track and field. Cheptegei's record-breaking run came at the Diamond League meet in Brussels, Belgium.