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By adding a GLPT3 (third-order G\"orling-Levy perturbation theory, or KS-MP3)term E3 to the XYG7 form for a double hybrid, we are able to bring down WTMAD2(weighted total mean absolute deviation) for the very large and chemicallydiverse GMTKN55 benchmark to an unprecedented 1.17 kcal/mol, competitive withmuch costlier composite wavefunction ab initio approaches. Intriguingly: (a)the introduction of E3 makes an empirical dispersion correction redundant; (b)GGA or mGGA semilocal correlation functionals offer no advantage over LDA inthis framework; (c) if a dispersion correction is retained, then simple Slaterexchange leads to no significant loss in accuracy. It is possible to create a6-parameter functional with WTMAD2=1.42 that has no post-LDA DFT components andno dispersion correction in the final energy.

Surprisingly Good Performance of XYG3 Family Functionals Using Scaled KS-MP3 Correlation