OpenAI's EU text watermark: Azure OpenAI is not covered yet
OpenAI's textGrain text watermark launched on 5 October 2026 in three states: on by default for ChatGPT and Codex in the EU, opt-in and off by default in the API, and not yet available through cloud partners such as Azure. Microsoft Foundry's provenance page lists only Claude models for text marking, so Azure OpenAI teams still own the Article 50(2) duty themselves, with the 2 December 2026 transitional deadline eight weeks away.
Claude's text watermark: what it means for Article 50
Anthropic will weave an invisible watermark into Claude's text output to meet the EU AI Act's Article 50 marking obligation, applying it globally across the API, apps and cloud platforms including Microsoft Foundry. What the mark can and cannot prove, which deployer duties remain yours, and when a DIY provenance layer still earns its keep on Azure.