Further exploring the deviations between the two forcefields we conducted binding energy calculations which revealed that ReaxFF predicts stronger binding energies at higher oxygen ratios compared to MACE-MP-0, which we attribute to an artificial stabilization by the Pt 6 O 8 species. By comparing the results from both forcefields to our DFT calculations we find that MACE-MP-0 provides binding energies in closer agreement with DFT results, supporting its reliability for describing oxidized platinum nanoparticles. These findings outline the importance of carefully reviewing the applicability of forcefields on a whole range of conditions, in our case, high oxygen ratios are not well described by ReaxFF. A less pronounced plateauing behavior occurring at high oxygen ratios is also observed on the computed binding energies using MACE-MP-0. To investigate the new regime predicted by both forcefields at high oxygen ratios we perform DFT calculations to investigate electronic properties. The projected density of states for Pt-5d orbitals reveals the appearance of intense, narrow peak close to the Fermi energy as oxygen ratio increases, contrasting with previous studies, which suggested a decrease in intensity close to the Fermi energy with a diffuse increase in intensity for lower states. We link this discrepancy to the lack of core oxidation in these previous studies, compared to this work, suggesting that the narrow peak close to the Fermi energy is due to complete oxidation. In contrast, the O-2p PDOS, displays smaller variations, which are localized within the low oxygen ratio range, suggesting that these species are in fixed electronic states for higher oxygen ratios.