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Fable's implementation of Borges's Library of Babel, finished posthumously by Opus 4.8. Quite accurate to the story. It is multiplayer (others appear as ghosts). You can locate key volumes, like the weights of GPT-1 & the code to the Library sim itself:

Ethan Mollick

391,749 subscribers

47,388 views • 3 months ago •via X (Twitter)

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24 Comments

Ethan Mollick3 months ago

Previously done with Claude 4.6: @danshipper also did a version (which I did not know until he posted on this thread).

Fedesco3 months ago

"posthumously": Someone's feeling anthropomorphic today :)

Kieran Klaassen3 months ago

Credit? @danshipper made it

Ethan Mollick3 months ago

@danshipper He did not

Kieran Klaassen3 months ago

@danshipper Ok, great minds think alike then!

Kick3 months ago

Crazy

Xavier3 months ago

credits to ?

Ethan Mollick3 months ago

Borges. I found out Dan Shipper did a version but I actually did an earlier one first ;)

Gregor3 months ago

not sure 'posthumously' holds if Opus just knows Borges well enough to rebuild from scratch. how would you even tell it was continuing Fable's work vs. regenerating the same thing independently?

Mel3 months ago

the meta layer is what makes this land the recursive choice to store the library's own code and real model weights inside it makes the infinite combinatorial space feel grounded rather than abstract

M.C. Vee3 months ago

Library of Babel the most important story of our time. Within the LLM weights are all the truths of the universe, and for each truth a near infinite number of false truths.

大伟｜AI × Web33 months ago

The concrete bit I would test here: Fable 对博尔赫斯《巴别图书馆》的实现，由 Opus 4.8 在身后完成。对故事相当忠实。它是多人游戏（其他人以幽灵形式出现）。你可以找到关键卷本，比如 GPT-1 的权重以及图书馆模拟本身的代码： https:// borges- The idea is useful only if the delivery path handles state, permissions, and rollback cleanly.

alex p.3 months ago

love buildin’ with codex 5.5 and opus 4.8 still but i am eager to get back to the “commissioning” approach that models like fable enable. loved your latest about this

HandsomeHam3 months ago

Yeah I'd shoot myself having to search a library like this

Sebastian Buzdugan3 months ago

two hard parts here presence sync for ghosts and index tricks so key volumes feel findable

Cameron Afzal3 months ago

omg brilliant. love borges. will explore and try this exercise with other stories too

Andy Baker3 months ago

WebXR mode, surely!

Evolution Plus AI3 months ago

Wonder what kind of horror game this will turn into... 😂

Rogério Caron Furquim3 months ago

wow

Uri Gil3 months ago

"posthumously" lol fable's not dead, he's just resting!

RpgBlaster3 months ago

Why is it so laggy? Don't tell me Fable just keep on using Three.js instead of others engine?

𝕘𝕣𝕚𝕤𝕥3 months ago

@fireandvision you read, ya?

Artificially Inclined™3 months ago

How many jump scares have you hidden in there?

Peter Austin ᛉ3 months ago

When I look at the mirror and press S to go backwards - I get trapped in the stairwell and W goes backwards.

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