While coupled cluster with singles, doubles, and perturbative triples (CCSD(T)) calculations are commonly considered as the "gold standard" of quantum chemistry, their computational cost is so high that the zeolite framework can only be represented using a small cluster model consisting of a few tetrahedrally coordinated atoms (T atoms). CCSD(T) calculations for such small clusters have been used as starting point to benchmark computationally less demanding methods, such as dispersion-corrected DFT or the random phase approximation (RPA). Correcting DFT results with pre-established correction factors based on coupled-cluster calculations can result in accurate energies (DFT/CC method [23,38,55] ). However, the calculation of these correction factors incurs a significant computational overhead for previously unstudied adsorbates. Embedding approaches in which different parts of the system are treated at different levels of theory (QM:QM methods) can deliver highly accurate adsorption energies, but may be difficult to apply for large guest molecules, where a significant fraction of the zeolite framework would have to be treated at the highest level of theory.