  We compute the next-to-leading order corrections to the gaugino masses $M_i$
in gauge-mediated models for generic values of the messenger masses M and
discuss the predictions of unified messenger models. If M<100 TeV there can be
up to 10% corrections to the leading order relations $M_i\propto \alpha_i$. If
the messengers are heavier there are only few % corrections. We also study the
messenger corrections to gauge coupling unification: as a result of
cancellations dictated by supersymmetry, the predicted value of the strong
coupling constant is typically only negligibly increased.
