GOP has superdelegates but they operate differently from the Dems. See below:
"In the Republican Party, the only people who get superdelegate status are the three members of each state's national party. This means that in the GOP, superdelegates are only about 7 percent of the total number of delegates.
The more important distinction, though, is that Republican superdelegates do not have the freedom to vote for whichever candidate they please. The Republican National Committee ruled in 2015 that their
superdelegates must vote for the candidate that their state voted for, and that's the biggest difference between Republican and Democratic superdelegates."