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For the large and chemically diverse GMTKN55 benchmark suite, we have studiedthe performance of density-corrected density functional theory (HF-DFT),compared to self-consistent DFT, for several pure and hybrid GGA and meta-GGAexchange-correlation (XC) functionals (PBE, BLYP, TPSS, SCAN) as a function ofthe percentage of HF exchange in the hybrid. The D4 empirical dispersioncorrection has been added throughout. For subsets dominated by dynamicalcorrelation -- particularly noncovalent interaction subsets -- HF-DFT is highlybeneficial, particularly at low HF exchange percentages. For subsets withsignificant static correlation (i.e., where a Hartree-Fock determinant is not agood zero-order wavefunction), HF-DFT may do more harm than good. While theself-consistent series show optima at or near 37.5% (i.e., 3/8) for all four XCfunctionals -- consistent with Grimme's proposal of the PBE38 functional --HF-BnLYP-D4, HF-PBEn-D4, and HF-TPSSn-D4 all exhibit minima nearer 25% (i.e.,1/4). Intriguingly, for HF-SCANn-D4, the minimum is near 10%, but the weightedmean absolute error (WTMAD2) for GMTKN55 is only barely lower than that ofHF-SCAN-D4 (i.e., where the post-HF step is a pure meta-GGA). The latterbecomes an attractive option, only slightly more costly than pure Hartree-Fock,and devoid of adjustable parameters other than the three in the dispersioncorrection. Moreover, its WTMAD2 is only surpassed by the highly empiricalM06-2X and by the combinatorically optimized empirical range-separated hybridswB97X-V and wB97M-V.

What types of chemical problems benefit from density-corrected DFT? A probe using an extensive and chemically diverse test suite