# What changes on 2 December 2026

Originally published at https://gifi.ai/blog/what-changes-on-2-december-2026

Article 50’s marking rule for generative systems applies from 2 December 2026. The duty is on the provider. A rewrite or a metadata strip does not meet it.

## The date

From 2 December 2026, providers of generative AI systems that serve the EU need a machine-readable mark so output can be detected as artificially generated. The Act does not name SynthID. Watermarking is how the Code of Practice proposes to meet the rule for free-form text.

## Who already marks text

Gemini ships SynthID-Text. Claude watermarks models launched on or after 2 August 2026. ChatGPT marks images and supported audio, not the words. Microsoft, Meta and Mistral signed the Code and have not published a text method.

## What this is not

It is not a duty Gifi can discharge for you. Changing words or stripping a local C2PA note does not make a provider compliant, and it does not retire a disclosure you still owe. The evergreen guide is /guides/eu-ai-act-text-marking.

## Primary sources

- [EU Code of Practice signatories](https://digital-strategy.ec.europa.eu/en/news/strong-backing-code-practice-transparency-ai-generated-content)