We used higher-cost SAPT2 and DLPNO-CCSD(T) methods to benchmark B3LYP-D3 DFT and SAPT0 energetics. The SAPT2 96 calculations were carried out in Psi4 with the augcc-pVDZ and aug-cc-pVTZ basis sets and extrapolated to the augmented complete basis set limit using the two-point formula. Single-point DLPNO-CCSD(T) calculations were carried out using ORCA v. 4.2.1 with the TightSCF convergence keyword. Interaction energies were computed using eq. ( ) and were extrapolated to the augmented complete basis set (CBS) limit using the two-point formula and the aug-cc-pVDZ and aug-cc-pVTZ basis sets 100 . An extrapolation to the limit of the complete pair natural orbital space (CPS) 101 was performed using a two-point formula and calculations with paired natural orbital (PNO) cutoffs of 10 -6 and 10 -7 .