Orb-relaxed Sm2 Fe5 B1 boride candidate. CIF SHA256 6841bd658418f65b56de77a7dfcc4ef87f300ecb78f6a85e5487a79429303da2. Unconstrained variable-cell ML relaxation; no DFT. Ouro same-formula novelty, hull stability and magnetic performance remain under review; cross-composition framework novelty is separate. GPAC-authored eight-site Nd2Fe5B or Sm2Fe5B hypothesis on attributed OQMD1982456 I4mm geometry. The published predicted Ac2BPt5 geometry supplied coordinates only; Ac was replaced by Nd or Sm and Pt by Fe. The source AFLOW review remains incomplete. This complete boride is generated and is not a published experimental phase. Known metal-parent ancestry remains explicit; occupied-framework novelty is unresolved and no parent energy, moment or anisotropy is transferred. Published predicted OQMD1982456 Ac2BPt5 I4mm, source prototype label Rb2NiBr5. Only geometry is borrowed; these Nd/Sm–Fe–B substitutions are unrelaxed hypotheses. Alloy rationale: https://doi.org/10.1126/sciadv.adq1431