Molecular dynamics simulations have revolutionized the ability of researchers to discover and assess new materials, aiding interpretation, error analysis, sensitivity analysis and prioritization of experimental studies. Ab-initio molecular dynamics simulations (AIMD) have been the premier method for modeling molten salt structure and predicting physical properties. However, due to high computational costs, AIMD simulations are practically limited to small system sizes (less than hundreds of atoms). Meanwhile, classical interatomic potentials can simulate large system sizes, but have recently been shown to inaccurately predict relative populations of bond angles and clusters, which play an important role in determining the thermo-physical and thermochemical behavior in structurally-complex salt mixtures. While such simulations have been used to interpret the general features and structures that exist in an experimental X-ray or Raman spectra, precise reconstruction and detailed analysis has not been possible. To overcome these limitations, recent developments of neural network molecular dynamics simulations (NNMD) have demonstrated that NNMD simulations can achieve near ab-initio accuracy, at orders of magnitude higher speed and scalability, for predicting the structures and properties of molten salts. Moreover, it was recently shown that larger NNMD simulations were required for accurately capturing the intermediate-range structures beyond the first solvation shell that can emerge in salts containing significant fraction of multivalent cations such as Zr. Structures of similar length scale have also been predicted for LiF-BeF 2 with dissolved tritium. In this work, we present a structural characterization of molten FLiBe including total scattering measurements and molecular dynamics simulations. We examined FLiBe using both neutron and X-ray diffraction from room temperature up to 700 °C, well above the melting point. Our measurements, conducted using renowned sychrotron X-ray and spallation neutron facilities, enabled higher resolution than prior X-ray diffraction measurements and a degree of detail inaccessible to previous studies. These high-resolution measurements are necessary to validate new molecular dynamics techniques. We performed AIMD and NNMD simulations to interpret the structural peaks found in measurements, and we provide several validation experimental datasets for both short-range and intermediate-range order in FLiBe melts at multiple temperatures.