Guess which of these LLM outputs is watermarked

gfysfm 11 points 5 comments August 20, 2026
sgoedecke.github.io · View on Hacker News

Discussion Highlights (5 comments)

arcwhite

Interesting, I did very badly, 3/10!

fwlr

Utterly imperceptible, even when studied under the microscope in a way that LLM text very rarely is in practice. It will be interesting to see whose concerns are assuaged (perhaps they genuinely though mistakenly believed it would degrade quality), and whose concerns are heightened (perhaps their real objection is that their AI-generated text will become detectable).

NotPractical

Could do with some context on how watermarking works. Objectively speaking it should be impossible to tell.

madarcho

If SynthID is a google technology, then this is likely just us training their ai again, captcha all over again.

Noumenon72

Please report success/failure after each test. Asking me to read and compare 30 writing samples to get any feedback at all means I won't finish. Telling me immediately when I got one wrong lets me recognize patterns and improve my guesses.

Semantic search powered by Rivestack pgvector
4,128 stories · 37,281 chunks indexed