Hunter won the High School Boys 3000-meter race as a high school sophomore at the Penn Relays Carnival in 2014. He went on to set the national sophomore class record in the 3000 metres event at 8:16.31. In the fall of 2014, Hunter placed 4th at the Foot Locker Cross Country Championships. Hunter won the New Balance National Indoor two-mile national title in a time of 8:48.22. He started his outdoor season with a 4:07 victory at the Penn Relays, becoming the first high school athlete since Olympian Matt Centrowitz to own both the high school boys 3K and mile Penn Relays titles. Hunter achieved a season best of 4:02.36 at the Adidas Dream Mile at the Adidas Grand Prix. He broke Grant Fisher’s 2-year undefeated run at the Brooks PR 2-mile championship, where he set a personal best of 8:42.51 in the event. He ended his 2015 track season with a 2nd-place finish behind collegian Blake Haney in the junior boys 1500m at the USATF Outdoor Championships. He closed the last 400 meters of that race in 53.10. Hunter set a personal best of 14:20 in the 5000 meters at the Third Battle Invitational. He set a course record of 14:26 at the Foot Locker South regional meet before winning his first Foot Locker National title in 14:55.7. In his indoor debut, Hunter broke the high school boys national indoor 3k record with a time of 7:59.33 at the Camel City Elite meet in Winston-Salem, North Carolina. He followed up that performance with another national record in the high school boys indoor mile, running 3:58.25 at the ArmoryTrack and Field Invitational. By doing this he became the 8th High School Athlete to break 4 minutes in the mile. He was also the second High School Athlete to break 4 in the mile indoors. Hunter then waited two weeks before resetting the record with a 3:57.81 performance at the Millrose Games. Hunter's 2016 outdoor season was also successful. He ran a 4:00.73 split in the 1600m to bring the Loudoun Valley boys the win in the DMR at the Penn Relays in 10:00.01. He returned to his best event, breaking 4 minutes again with a 3:58.86 at the Pre Classic.
Professional
On August 5, 2016, Hunter placed 6th overall in the men's mile race at the 2016 Sir Walter Miler, finishing in 3:57.15. It was his first race since graduating from high school. On February 11, 2017, Hunter participated in the NYRR Millrose Games Wanamaker Mile, where he placed seventh in 3:56.80. On February 23, 2019 Hunter won the USA Indoor Track & Field Championships two mile with a meet record time of 8:25.29.