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Fixes exist but each must be retuned for each material.","posed_since":"","precise":"Find a generalized Kohn-Sham functional with no system-specific tuning that gives the fundamental gap $I - A$ ($I = \\text{ionization energy}, A = \\text{electron affinity}$) of molecules (the GW100 set of ionization potentials and electron affinities and similar sets) and the band gap of semiconductors and insulators (Si to LiF) with mean absolute error below $0.2\\,\\mathrm{eV}$. An answer is such a functional or an argument that tuning-free accuracy at this level requires orbital-dependent nonlocal terms of a specified type.","problem_ref":null,"references":"","settled_by":"Benchmark against experimental and many-body (GW, coupled-cluster) gaps across molecules and solids with a single parameter set.","status_note":"","title":"System-independent functional giving fundamental gaps of molecules and 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