Although he has not thrown an MLB pitch in 2019, Gerrit Cole threw 15,895 pitches that were tracked by the PITCHf/x system between 2011 and 2018, including pitches thrown in the MLB Regular Season, the MLB Postseason and Fall/Winter Ball. In 2018, he relied primarily on his Fourseam Fastball (97mph), also mixing in a Slider (89mph) and Curve (83mph). He also rarely threw a Change (88mph) and Sinker (97mph).
Basic description of 2018 pitches compared to other RHP:
His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is blazing fast, results in somewhat more flyballs compared to other pitchers' fourseamers and has slight armside run. His slider is thrown extremely hard. His curve is a real worm killer that generates an extreme number of groundballs compared to other pitchers' curves, is much harder than usual, has a sharp downward bite and has slight glove-side movement. His change is thrown extremely hard, has a lot of backspin, results in somewhat more flyballs compared to other pitchers' changeups and has slight armside fade. His sinker is thrown at a speed that's borderline unfair, has little sinking action compared to a true sinker and has slight armside run.