# clm_D58FC12544C0

subject: Muse Spark Open (/record/muse-spark-open.md)  
predicate: model_release  
value: Muse Spark Open  
valid_from: 2026-10-15  
valid_to: null  
published: 2026-10-15  
recorded: 2026-11-04  
confidence: 0.95  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-04  
checked: 2026-11-04 · its source page states the value and the date  

> Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date October 15, 2026

What https://research.meta.ai/blog/muse-spark-open says, word for word.

## Sources

- https://research.meta.ai/blog/muse-spark-open (primary, Meta (Meta AI Research blog), published 2026-10-15)

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