How this was checked

What a substantial modification is

Verified · last checked Settled, with the evidence a claim at this level needs.

Under the EU AI Act, a substantial modification is a change to an AI system after it has been placed on the market or put into service which is not foreseen or planned in the initial conformity assessment carried out by the provider, and as a result of which either the system's compliance with the requirements of Chapter III, Section 2 is affected or the intended purpose for which the system has been assessed is modified.

At a glance

The statement laid out, in its own words. The statement above and its sources are what count.

A substantial modification is a change

  • made after the system was placed on the market or put into service
  • not foreseen or planned in the provider's initial conformity assessment

with one of two results

  • the system's compliance with the requirements of Chapter III, Section 2 is affected
  • or the intended purpose for which the system was assessed is modified

Where the book relies on it

Kind of evidence
documentarySettled by a first-hand source, quoted below with the day it was read.

The evidence

(23) 'substantial modification' means a change to an AI system after its placing on the market or putting into service which is not foreseen or planned in the initial conformity assessment carried out by the provider and as a result of which the compliance of the AI system with the requirements set out in Chapter III, Section 2 is affected or results in a modification to the intended purpose for which the AI system has been assessed;

Regulation (EU) 2024/1689, Article 3, point (23), in the consolidated text CELEX 02024R1689 as consolidated on 27 July 2026 (English). Read from sources/eu-ai-act/02024R1689-20260727-consolidated-EN.html, downloaded from EUR-Lex on 2026-10-08, and re-read on 2026-10-21 in its plain text at out/legal/consolidated-en.txt. The point sits under the base marker: Regulation (EU) 2026/1744 did not amend it. The typographic quotation marks are transcribed as plain ones., read

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