2023: two-year-old season Jantar Mantar debuted at the
Kyoto Racecourse on October 8, 2023, in a two-year-old newcomer race on turf at a distance of 1,800 meters. Ridden by Katsuma Sameshima, he was the second favored horse. After settling in a good position from the start of the race, he broke away at the final stretch to win by two and a half horse lengths over Keep Calm. On December 17, he made his first grade one stakes race debut at the
Asahi Hai Futurity Stakes at
Hanshin Racecourse. Ridden by
Yuga Kawada, he was the most favored horse to win the race. Settling near the rail at the middle of the pack early on, he moved up near the front by the fourth corner as the race progressed. Then at the final straight, he quickly broke away from the pack and successfully held off the fast-finishing Ecoro Walz to win the race and clinch his first grade one win.
2024: three-year-old season Jantar Mantar first race as a three-year-old was the
Kyodo Tsushin Hai, moving back up to a distance of 1,800 meters at
Tokyo Racecourse. He settled in midfield throughout the race but failed to chase down
Justin Milano, who moved up early, and finished in second place. Two months later, he once again moved up in distance to race at the
Satsuki Shō (Japanese
2000 Guineas) over 2,000 meters at
Nakayama Racecourse. After keeping up with
Meisho Tabaru, he moved up to the front early in the final stretch but was overtaken by Justin Milano and and ended up in third place. Three weeks later, he dropped down in distance to a mile to race in the
NHK Mile Cup at Tokyo Racecourse. He broke off well from the gates and settled in a good position up front. In the final straight, he pulled away from the pack and maintained the lead to win the race, holding off
Ascoli Piceno. After the race, he was set up for
Fuji Stakes but was forced to withdraw after developing a fever. He was invited to run in
Hong Kong Mile next but due to a lengthy rest period and having just recovered from the fever, he ran poorly, was hit by horses on both sides during the race, and finished in 13th place.
2025: four-year-old season He returned to Ritto Training Center in May in order to prepare for
Yasuda Kinen. During the race, Jantar Mantar was quick out of the gate and raced prominently in third behind Mad Cool. His jockey, Yuga Kawada, then started to accelerate after the 400 meter pole, and maintained a position at the front to win by one and a half lengths. This marked the first occasion where the winner of the NHK Mile Cup also won the Yasuda Kinen in the same season. His owner registered him in the
Prix Jacques le Marois and
Prix du Moulin de Longchamp but later cancelled the trip and prepared for the
Fuji Stakes, which he had missed in 2024 due to a fever. Jantar Mantar ran well in this race but was overtaken by Gaia Force around 400 metres from the finish and placed second. This result qualified him for the second major mile race in Japan, the
Mile Championship. In the race, Jantar Mantar stayed in around third as Toshin Macau ran out from the pack into the first position. As Toshin Macau began to lose speed, Jantar Mantar began to accelerate and was in the lead 300 meters away from the finish. He extended his lead and defeated the second-place Gaia Force by three-quarters of a length. He became the first horse to win all four Japanese mile races available for colts and also set a new speed record for the Mile Championship, with a finishing time of 1:31.3. He also became the ninth horse after Nihon Pillow Winner,
North Flight,
Taiki Shuttle,
Air Jihad,
Daiwa Major,
Maurice,
Indy Champ and
Gran Alegria to win the Yasuda Kinen (spring mile race) and the Mile Championship (autumn mile race) in the same season. At the end of the 2025 racing season in Japan, he was awarded the 2025
JRA Award for Best Miler. == Racing statistics ==