Fable 5 passes the author identification test on my unpublished writing. I can no longer write anonymously.
Fable 5 passes the author identification test on my unpublished writing. I can no longer write anonymously.
Many users expressed excitement about Fable 5 AI identifying authors from unpublished writing samples because it shows strong progress including admitting uncertainty and opens possibilities like revealing Satoshi's identity.

Unlike with more prolific writers like @KelseyTuoc, this was not true of prior models, which would more often guess someone in my vicinity.

@coldhealing isn't the NYT claiming they did basically this already?
https://www.nytimes.com/2026/04/08/business/bitcoin-satoshi-nakamoto-identity-adam-back.html?unlocked_article_code=1.ZVA.5_s8.hTKeCkV97kow&smid=tw-share

@KelseyTuoc caveat: I tried with a second unpublished passage (a dialogue talking about my Germany trip), providing different-length excerpts to it, and it got it wrong each time. so it's still not perfect at figuring me out, but it's closer than prior models were.

@tracewoodgrains Soon we will be able to do this for Satoshi

@tracewoodgrains I will bet you that it's got your identity in the context window and used that to figure it out, and that it has very little if any current ability to identify author by textual analysis.

@tracewoodgrains Hmm is it still able to identify you if you remove paragraphs beginning with "As a gay ex-Mormon furry,..."?

@undrenalin disclaimer that these are all scattered thoughts that I haven't gotten around into pulling into a proper essay yet

@tracewoodgrains Seems it’s responding based on context you’ve given it / has access to chat memory (since it’s replying in lowercase). What happens if you ask it in ghost mode?

@tracewoodgrains @KelseyTuoc I uploaded a legal philosophy essay I wrote for a law school class more than 20 years ago (!!), and it identified me as the author. CRAZY.

@tracewoodgrains someone has to make a formal benchmark outta this, it's too good

@yimbosf ha – I deliberately chose one with no personally identifying info or "as the author" stuff included, because I do tend to leave autobiographical tells in my writing

@yasmeena_khan I have these instructions: "be terse, highly intelligent, razor-sharp, witty, and direct. use lowercase as the user does. speak in prose unless you have a strong reason to do otherwise."
It has no memory or context beyond that.

@tracewoodgrains Same! Opus v. Fable:
Though it would probably struggle if presented with text on a less "signature AK" theme.

@tracewoodgrains I’m clear on my one (1) piece of poetry

@tracewoodgrains Well, well . . . !

@tracewoodgrains Didn’t realize you were Chinese.

@tracewoodgrains I gave it my last 9 posts, and it wasn't able to identify me (not surprising because I'm a pretty small account), though amusingly, one of its 10 guesses was you, lol.

@tracewoodgrains I think search chats is separate from memory? But it usually tells you when it’s doing that, I suppose. It just seemed like a fairly personalized answer so I was curious. But maybe that’s just really well-worded responded personalization!

@tracewoodgrains I got super excited that I'd missed not one but TWO sequels to my favorite games 💔

@tracewoodgrains It can’t access information across conversations? Curious if the answer meaningfully changes in ghost mode anyways.
Fable 5 passes the author identification test on my unpublished writing. I can no longer write anonymously.