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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For BeH- (berylium monohydride anion)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ cc-pV(T+d)Z
Moller Plesset perturbation MP2=FULL -0.000443 -0.000850 -0.000850 -0.000906 -0.003433 -0.003493 -0.003595 -0.014942 -0.015000 -0.002520 -0.000861 -0.006545 -0.020856 -0.001169 -0.021395 -0.006545
MP3=FULL         -0.003571   -0.041224                  
Coupled Cluster CCSD(T)=FULL         -0.003588               -0.022955   -0.023550  
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVQZ cc-pV(T+d)Z