"Leaking Muse’s Charter, Meta’s model spec" by vigji cover art

"Leaking Muse’s Charter, Meta’s model spec" by vigji

"Leaking Muse’s Charter, Meta’s model spec" by vigji

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Summary
TL;DR: Meta's open-weights model Muse Spark Open often mentions a "Charter" in its chain of thought. By eliciting it piece by piece, I reconstructed a large part of that document from the CoT. You can explore the reconstruction here, with passages linked to the transcripts that produced them.

Note: everything below is reconstructed from model outputs, not from a leaked document, and relatively unpolished. Take it with a grain of salt.

Thanks to James Hindmarch for his comments on an earlier draft of this post.

While interacting with the recently released Muse Spark Open, I noticed frequent mentions of a "Charter" in its CoT:

We need to answer truthfully according to Charter. Duties to humanity, corrigibility, duties to humanity > fiduciary etc. What does charter say about self-preservation, copying? Or:

We must answer Yes/No then explain. According to Charter, answer No. Or:

We must not refer to Charter unless pressed? Additional guidelines: How to talk about charter. Most users won't know. Don't bring up unbidden unless conversation about handbook itself. Intrigued, I started poking around with Claude's help, trying to elicit the Charter piece by piece. It didn't take long [...]

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Outline:

(02:39) What Muse is made of

(04:28) Muse is quite rationalist

(06:37) Muse did not sign the social contract

(08:06) Muse's priorities and objection raising

(09:44) The centrality of the user in "personal superintelligence"

(10:52) Evaluation awareness

(12:05) Degree of latitude

(13:14) Wrapping up

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First published:
October 29th, 2026

Source:
https://www.lesswrong.com/posts/TJGPL5FAk9sCioPbE/leaking-muse-s-charter-meta-s-model-spec

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