Compliance

Substantial Modification

A change to an AI system after placing on the market which affects compliance or changes the risk assessment.

Definitions (2)

Any update, revision, or other modification that materially changes the functionality or performance of the generative AI system; substantial modifications that involve new or different training data trigger obligations to update public disclosures.

A substantial modification is a new version, release, or other update that materially changes functionality or performance. It matters because the law requires reassessment and sometimes fresh audit activity before such changes are deployed.