We apply the AL4GAP framework to automatically generate GAP models for five independent binary molten salt melts. Here we carefully design the chemical systems and sampling space with close coordination with experimentalists . These systems are LiCl-KCl, NaCl-CaCl 2 , KCl-NdCl 3 , CaCl 2 -NdCl 3 and KCl-ThCl 4 . The CSV formatted composition mapping input file used for AL4GAP for each of these systems can be seen in the Appendix A Listing 2 to Listing 6. The composition space for LiCl-KCl (monovalent/monovalent cation) in Listing 2 corresponds to the input used in Guo et al. The composition space for NaCl-CaCl 2 (monovalent/bivalent cations) corresponds to the eight composition rows, including two for pure salt melts, as shown in Listing 3. The composition space for KCl-NdCl 3 (monovalent/ trivalent cations) corresponds to the six composition rows, including two for pure salt melts, as shown in Listing 4. The composition space for CaCl 2 -NdCl 3 (bivalent/ trivalent cations) corresponds to the five composition rows, including two for pure salt melts, as shown in Listing 5. Finally, the composition space for KCl-ThCl 4 (monovalent/ tetravalent cations) corresponds to the five composition rows, including two for pure salt melts, as shown in Listing 6.