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Published ·Anthropic• Minor

Claude Fable 5.1 and Mythos 5.1 text is watermarked; supported Files API media gets C2PA credentials.

The read

Provenance marking runs without request or response handling changes, so existing Claude API workflows keep their shape.

The frame

It sits inside the Files API and code execution path, making generated text and supported media identifiable at retrieval.

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Anthropic
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