The fourth batch of Finnish research projects to utilize LUMI, Europe’s fastest supercomputer, have been chosen, and will run on the system using its massive GPU capacity. The projects are, for example, continuing the development of computational pathology tools, advancing multimodal AI across dozens of languages, studying small-scale dynamos in stellar convection zones and much more. The resources were granted in the Fourth Finnish LUMI Extreme Scale Call, which shared resources from Finland’s country share of the LUMI resources. The accepted projects are: