Rubuta ci gaba don wannan sakin layi - Lokacin 2014 ya kasance mataki ne na baya a kan hanya don Cheptai, yayin da ta gama ƙasƙanci a tseren Diamond League kuma ta kasa inganta mafi kyawunta. Ta sami ci gaba a tseren hanya, duk da haka, ta zo ta biyu a Groningen Four-Mile Run da Nairobi Diamond 10K Run, ta kafa mafi kyawun minti 31:45 a karshen. Ta fara horo tare da kulob din wasan motsa jiki na Turkiyya Üsküdar Belediyesi kuma ta kawo nasarar kulob din a cikin rukuni na mutum da rukuni a gasar cin kofin zakarun Turai ta Turai. Bayan lashe Gasar Ganowa ta Kenya, an sake zaɓar Cheptai ga ƙungiyar Kenya don Gasar Cin Kofin Duniya ta IAAF ta 2015
kuma ya kai sabon matsayi a matsayi na bakwai, ya lashe lambar azurfa tare da Kenya. A 2015 IAAF Diamond League circuit, ta sanya a cikin manyan shida na 5000 m a Shanghai Golden Grand Prix, Prefontaine Classic da Wasannin Bislett. Gasar ta biyu ga Viola Kibiwott a Gasar Cin Kofin Duniya ta Kenya ta 2015 ta ba ta wuri a cikin manyan 'yan wasan ta na farko na Kenya.