Koech won a bronze medal at the
2021 World Athletics U20 Championships in the
3000m Steeplechase behind compatriot
Amos Serem who won gold. In May 2023, he surprised five-time champion
Benjamin Kigen to win the Kenyan Defence Forces Championship in the 3000m Steeplechase. In July 2023, Koech won the 3000m Steeplechase at the Kenyan national trials, running 8:22.55 aged just 20 years-old, to finish ahead of
Abraham Kibiwott and
Leonard Bett. On 21 July 2023, he made his debut in the
Diamond League event in Monaco. He won the 3000m Steeplechase in a time of 8:04.19, a new personal best time. The time also met the qualification standard for the 2023 World Championships in Budapest. He competed in the
3000 metres steeplechase at the
2023 World Athletics Championships in
Budapest in August 2023 and qualified for the final, in which he finished seventh. In March 2024, he won bronze in the 3000m steeplechase at the
African Games. He competed at the
2024 Summer Olympics in
Paris in the 3000 metres steeplechase, placing seventh in the final. He finished third in the 3000 metres steeplechase at the
2025 Xiamen Diamond League event in China, in April 2025. He also finished third in the 3000m steeplechase at the
2025 Shanghai Diamond League event in China on 3 May 2025. He won the 3000m steeplechase title at the Kenyan Athletics Championships in June 2025. In September 2025, he competed in the 3000 metres steeplechase at the
2025 World Championships in
Tokyo, Japan. == References ==