The Wikipedia article on Grand Unified Theory says:
"GUT models predict that at even higher energy, the strong interaction and the electroweak interaction will unify into a single electronuclear interaction. This interaction is characterized by one larger gauge symmetry and thus several force carriers, but one unified coupling constant".
Do I understand correctly that in the GUT era there were as many types of force carriers, that is, bosons, as after this era (although after that some bosons simply acquired mass)? That is, after breaking the symmetry and separating different forces, the number of particle types did not change?