rankings / suite / OOD-X

OOD-X — Held-out chemistries — the generalization test

OOD-X contains 2,400 periodic structures, referenced against r²SCAN, released as r2026.2. It scores Formation energy (meV/atom), OOD degradation (×).

Reference generation: Same DFT protocol as FormE-40k; entire chemistry classes absent from MP/Alexandria/OMat24 training corpora (see contamination audit)

Provenance: Generated in-house