AI brief
A LessWrong author says Meta's open-weights model Muse Spark Open frequently mentions a "Charter" in its chain of thought, and by eliciting it piece by piece reconstructed much of the document from that output.
Why it matters: It suggests internal instructions given to an open-weights model can be partly surfaced through its own reasoning traces.
Written by AI from LessWrong's published text.
Background
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Meta
- Latest funding
- $95B · 26 Oct 2026
- Newest model on the API
- Muse Spark Open · 15 Oct 2026 · $1.25 in / $4.25 out per million tokens
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Source
“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.”
Interpretation or community commentary rather than straight reporting.
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