However, this agreement belies the variability amongst the functionals. We compared the spin predictions of each functional against available reference data and our DLPNO-CCSD(T) results (Figure ). Aside from the marginally best-performing B3LYP (17/20) and worst-performing B2PLYP (15/20), all functionals correctly predicted multiplicities for 16 of the 20 species. However, the erroneous species generally differed from functional to functional, and there was no obvious benefit from moving up rungs of Jacob's ladder. As a result, B2PLYP predicts different ground state spins than any of BP86, PBE, and TPSSh for a concerning 9 out of the 20 studied complexes (Figure ). Disagreements between functionals do appear to be tied strongly to the impact of exact exchange, with the functional with a higher proportion of exact exchange almost always predicting the higher multiplicity.