| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:26.97 | MAC Winter Invitational | 2026-01-22 |
| 100m Backstroke | 1:24.04 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 1:42.67 | 2025 Age Group International SC | 2025-11-27 |
| 100m Butterfly | 1:33.79 | MAC Winter Invitational | 2026-01-22 |
| 100m Butterfly | 1:30.51 | Western Region Short Course Championships | 2026-02-12 |
| 100m Freestyle | 1:20.21 | MAC Winter Invitational | 2026-01-22 |
| 100m Freestyle | 1:18.38 | 2025 Age Group International SC | 2025-11-27 |
| 200m Backstroke | 3:06.58 | MAC Winter Invitational | 2026-01-22 |
| 200m Backstroke | 3:02.11 | Western Region Short Course Championships | 2026-02-12 |
| 200m Breaststroke | 3:32.79 | GHAC Winter Invitational SCM | 2026-03-06 |
| 200m Freestyle | 2:55.15 | MAC Winter Invitational | 2026-01-22 |
| 200m Freestyle | 2:57.47 | 2025 NYAC Cup | 2025-11-14 |
| 200m IM | 3:13.71 | MAC Winter Invitational | 2026-01-22 |
| 200m IM | 3:04.56 | Western Region Short Course Championships | 2026-02-12 |
| 400m Freestyle | 6:14.14 | Dean Boles Invitational Meet | 2026-01-10 |
| 50m Backstroke | 38.18 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Backstroke | 38.37 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 56.81 | MAC Rising Star #2 | 2025-05-30 |
| 50m Breaststroke | 47.92 | 2025 Age Group International SC | 2025-11-27 |
| 50m Butterfly | 41.63 | MAC Winter Invitational | 2026-01-22 |
| 50m Butterfly | 39.50 | 2025 NYAC Cup | 2025-11-14 |
| 50m Freestyle | 36.38 | MAC Winter Invitational | 2026-01-22 |
| 50m Freestyle | 33.29 | Western Region Short Course Championships | 2026-02-12 |
Cox, Harper's top personal bests include 100m Backstroke (1:26.97), 100m Backstroke (1:24.04), 100m Breaststroke (1:42.67), 100m Butterfly (1:33.79), 100m Butterfly (1:30.51).
Cox, Harper swims for Region of Waterloo Swim Club.
Cox, Harper has competed in 10 meets.