https://aiwatermarking.org/news/ Dated items on how AI systems mark generated content, each linked to the primary source that changed. en https://aiwatermarking.org/news/2026-09-20-which-claude-models-carry-the-watermark/ https://aiwatermarking.org/news/2026-09-20-which-claude-models-carry-the-watermark/ Sun, 20 Sep 2026 00:00:00 +0000 Anthropic's help article now names the models with the text watermark: Fable 5.1, Mythos 5.1 and Opus 5. Older models are covered during a transition period. https://aiwatermarking.org/news/2026-09-20-claude-watermark-detector-private-preview/ https://aiwatermarking.org/news/2026-09-20-claude-watermark-detector-private-preview/ Sun, 20 Sep 2026 00:00:00 +0000 Since 1 September 2026 Anthropic offers a detection API in private preview to organisations obliged under EU law. Individuals still have nothing to run. https://aiwatermarking.org/news/2026-09-20-claude-api-c2pa-fourteen-formats/ https://aiwatermarking.org/news/2026-09-20-claude-api-c2pa-fourteen-formats/ Sun, 20 Sep 2026 00:00:00 +0000 Anthropic's docs now list the 14 image, video and audio formats the Claude API signs with C2PA, and what the manifest holds. Text and PDFs are not signed.