Anthropic has confirmed that its Claude AI models now watermark generated text and files, making it easier to gauge the authenticity of material — with major ramifications for slop and privacy issues. An updated support page reveals that all Claude models launched from August 2, 2026 onward add watermarks. Why does Claude watermark AI text and files? Related I tested over 100 Claude Code plugins—here are the 5 that actually matter I installed over 100 Claude Code plugins so you don't have to. Even though the watermarks won't directly identify you, they will show that someone used Claude and aid efforts to trace the origins of your work.