Trained On AI training-data disclosure

EU AI Act Article 53

What the obligation requires of general-purpose AI model providers, which deadline applies to which models, and — kept current below — which models have actually published.

9 of 35 tracked models have a published summary · 7 filed documents read in full

The four obligations

Article 53(1) of Regulation (EU) 2024/1689 places four duties on the provider of a general-purpose AI model. Only two of them produce something the public can see, which is why this register tracks those two.

  1. (a) Technical documentation. Kept and provided to the AI Office and national authorities on request. Not public.
  2. (b) Information for downstream providers. Enough for someone building on the model to meet their own obligations. Supplied on request, not published — which is why a deployer has to ask for it.
  3. (c) A copyright policy. A policy to comply with Union copyright law, including honouring reservations of rights from the text-and-data-mining exception.
  4. (d) A training-data summary. A sufficiently detailed public summary of the content used for training, following the AI Office's template. This is the one that is genuinely public, and the one this register is built around.

Models released under a free and open-source licence are exempt from (a) and (b), but not from (c) and (d) — the copyright policy and the training-data summary are owed regardless. Models presenting systemic risk carry further duties under Article 55.

Which deadline applies

Placed on the EU market from 2 August 2025 Comply at release
Already on the market before that date Comply by 2 August 2027
Commission enforcement powers Began 2 August 2026

Most of the models people can name predate the cutoff. For them a missing summary means not yet due, and reading it as a breach is the commonest error made about this obligation — including, for a while, by this register. The register now records a placement date wherever a provider states one, and says nothing where none is stated.

Common questions

What does Article 53 of the EU AI Act actually require?
Providers of general-purpose AI models must keep technical documentation, give downstream providers the information they need to meet their own obligations, put in place a policy to comply with EU copyright law, and publish a sufficiently detailed summary of the content used to train the model, following a template published by the AI Office.
When did it start applying?
For models placed on the EU market from 2 August 2025, at release. For models already on the market before that date, the deadline is 2 August 2027. The Commission's enforcement powers began on 2 August 2026. This distinction decides whether a missing summary means "late" or "not yet due", and it is the single most misread thing about the obligation.
What is the training-data summary template?
The AI Office published a mandatory template on 24 July 2025. It asks for provider and model identification, the date the model was placed on the Union market, the modalities present in the training data and their size bands, and a list of data sources — public datasets, commercially licensed data, crawled web content and user data — plus how text-and-data-mining rights reservations were honoured.
How often must the summary be updated?
Every six months, or sooner if there is a material change such as further training. A summary published once and left alone stops satisfying the obligation.
Does signing the Code of Practice mean a provider has published a summary?
No. They are separate acts. Signing is a voluntary commitment recorded by the Commission; publishing is the obligation itself. This register tracks both, and they do not track each other — one provider on the Commission's list has filed summaries while signing only the Safety chapter, and others have signed in full and published nothing we can find.
I use a general-purpose model in my product. What do I have to do?
Building on a model generally makes you a downstream provider with obligations of your own, and those do not transfer from the model's provider. You are expected to do your own diligence and to request the information package the provider owes you under Article 53(1)(b). Every model page here lists what this register could and could not find of that material.

Which models have published

9 of the 35 models tracked here have a published training-data summary. The full list, with the source document and the date each claim was checked, is on the register. What those documents actually say — which answers were ticked on the template — is compared on disclosures.

Not legal advice. This page describes what the obligation says and records what providers have published; whether any particular obligation applies to you, or has been met, is a question for a lawyer and ultimately for the Commission.