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Answer: normal or inverted.","problem_ref":"39015d3bd3dc418826d0f250280ff88e9ffaca603aadb4336b3c7f141052a6ce","references":"","settled_by":"JUNO reactor spectral data over about 6 years combined with DUNE and atmospheric experiments.","status_note":"JUNO 207-day data combined with long-baseline accelerator $\\Delta m^{2}_{31}$ constraints (arXiv:2609.37895, September 2026) favor normal ordering at one-sided $\\ge 2.1\\sigma$ for all $\\delta_{\\mathrm{CP}}$ (Bayes factor 10.18); global fits (NuFit-6.0, 2024) also lean normal; the 2025 NOvA plus T2K joint fit prefers neither.","title":"Is the neutrino mass ordering normal or 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