The 24-year-old world bronze medallist on Tuesday clocked 3:53.09 to wrap up the convincing win, beating the previous world indoor record of 3:55.17 set by compatriot Genzebe Dibaba in 2014.
At the time, such changes were considered controversial, but not nearly as controversial as the plan to put the calendar back into sync with the seasons.
Gidey's winning time of 14:06.62 took almost five seconds off the previous world 5000m record, set by fellow Ethiopian Tirunesh Dibaba in Oslo in 2008. Cheptegei, meanwhile, covered 10,000m in 26:11.00
