We further tested the ML model on datasets with existing quantum-chemical calculations, so we could benchmark our method against QM methods. In particular, we were interested in comparing our results to cluster-continuum quantum chemistry approaches, which have been used in recent years to compute solvation free energies of ionic solutes. To further bench- mark our model, we obtained a set of molecules with experimental values and hybrid clustercontinuum calculations of solvation free energies in acetonitrile (Pliego/nonoverlap). The seven solutes are not in our training corpus (even including in non-acetonitrile solvents).