Although he has not thrown an MLB pitch in 2020, Gerrit Cole threw 19,806 pitches that were tracked by the PITCHf/x system between 2011 and 2019, including pitches thrown in the MLB Regular Season, the MLB Postseason and Fall/Winter Ball. In 2019, he relied primarily on his Fourseam Fastball (97mph) and Slider (89mph), also mixing in a Curve (83mph) and Change (89mph). He also rarely threw a Sinker (96mph).
Basic description of 2019 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, has slight armside run and has some added backspin. His slider is thrown extremely hard and generates more whiffs/swing compared to other pitchers' sliders. His curve is much harder than usual, results in many more groundballs compared to other pitchers' curves, has a sharp downward bite and has slight glove-side movement. His change is thrown extremely hard, generates more whiffs/swing compared to other pitchers' changeups, has a lot of backspin and has slight armside fade. His sinker (take this with a grain of salt because he's only thrown 13 of them in 2019) is basically never swung at and missed compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, is blazing fast, has little sinking action compared to a true sinker and has slight armside run.