Hot tearing defects commonly occur during the casting of industrial metals. Over the years, this defect has been extensively studied, from macroscopic criteria relating hot tearing susceptibility to the solidification interval, permeability, stress, strain and strain-rate, to microscopic examinations of grain coalescence. Recently, multi-physics or granular solidification models have been developed that combine fluid flow behaviour at the scale of the microstructure with stress/strain behaviour at the scale of the component. In this presentation, a comparison of recent advances in modelling of hot tearing in steel and aluminum alloys will be made identify common mechanisms as well as differences in behaviour. This will assist in identifying new directions of research with the goal of improve quantitative hot tearing prediction.