How Claude's text watermarking works

Future Claude models will incorporate text watermarking to indicate the likelihood of AI involvement in text generation, aligning with the EU AI Act. This watermark subtly influences token choices, but is less applied to exact content like code or simple sums. Additionally, Claude will attach C2PA content credentials, a cryptographically signed note in metadata, to supported file types like .png, .jpg, or .svg, to show that the file was made or processed with Claude.