AT that time, Kipyegon missed the world record of 3:50.07 set by Ethiopia's Genzebe Dibaba in 2015 by just 0.3.
This time, Kipyegon blew the mark apart, becoming the first woman to break 3:50 in the discipline and taking almost a second off the previous record.
Kipyegon had been open about her world record ambition in 2023.
"The record is in my heart and on my mind and I hope this will be a perfect year for me," she said on the eve of the Golden Gala.