Kammala jumla mai zuwa: Lokacin 2014 ya kasance mataki ne na baya a kan hanya don Cheptai, yayin da ta gama ƙanƙanta 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 zabar Cheptai ga tawagar Kenya don gasar
2015 IAAF World Cross Country Championships kuma ya kai sabon matsayi a matsayi na bakwai, inda 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.