EU AI Omnibus grants December 2 grace period for AI-generated content marking — Article 50 obligations split between fresh and grandfathered systems
The EU AI Omnibus provisional agreement of May 2026 grants generative AI systems already on the market before August 2 a four-month grace period — until December 2, 2026 — to meet the machine-readable marking requirement under Article 50(2). New systems entering the market after August 2 face the full obligation immediately. The split creates a clear compliance bifurcation between incumbents and new entrants.
The substantive piece is the structural advantage to incumbents. Existing generative AI systems (OpenAI ChatGPT, Anthropic Claude, Google Gemini, Meta AI) now have until December 2 to implement machine-readable content marking — additional four-month runway to ship the deployment infrastructure. New entrants must ship marking as a Day-1 feature. For mid-market AI startups planning H2 2026 launches into the EU, this is now a material competitive disadvantage relative to the established US labs.
The technical implementation is converging on C2PA-style provenance metadata embedded at the model-output layer. The final Code of Practice on AI-generated content marking is expected to land in June 2026 ahead of the August deadline. For ai-blogs.org-class publications and the broader content-creator stack using image and video generators, the deployer-side labelling rules of Article 50 remain on the original August 2 timeline regardless of the December grace for model providers.
Kennedys Law — The EU AI Act implementation timeline: understanding the next deadline for compliance → · Artificial Intelligence Act — The EU AI Act's Transparency Rules: A Practical Guide to Article 50 → · European Commission — Commission publishes first draft of Code of Practice on marking and labelling of AI-generated content →