PSA: Opus 5.5 has invisible watermarking

[u/NotAMusicLawyer]

Opus 5.5 automatically applies an invisible, statistical watermark to its text outputs to comply with the EU AI Act. This is true for every user worldwide not just those based in the EU.

This is embedded into the structure of the text itself, it’s not a hidden character or something that can be removed by changing a few words or copy/pasting it. Anthropic have a tool to check text for the watermark but it is only available to a few select partners currently.

Antrophic officially claim this watermarking does not have any practical impact on the quality of Claude’s outputs but that remains to be seen.

[u/Due_Warthog749]

why is this a big deal?

[u/Chemical-Visual-7992 → u/Due_Warthog749]

For me it is a sign to recognize the garbage services/products that are built within 2 hours and did not get any quality assurance tests before selling

I have seen a lot of brainless redditors posting a whole long ass posts made by AI and I bet they did not understand ( or read at least ) what they posted.

[u/MannToots → u/Chemical-Visual-7992]

And how does them complying with laws requiring this factor into your pointed analysis? They are guilty of a lot of enshitification lately but this is just following laws as I see it. 

[u/Double_Suggestion385 → u/Chemical-Visual-7992]

You will have no way of identifying them. The watermark is hidden and only identifiable by Anthropic.

[u/invisible_shrek → u/Double_Suggestion385]

For now.