Model releasesOctober 15, 2026Impact
Meta returns to open weights with Muse Spark Open
Meta Superintelligence Labs released Muse Spark Open, an open-weights model, three days after launching its closed flagship Muse Wonder.
Why it matters
After a year of closed releases, Meta is again putting competitive weights in the open, keeping pressure on Chinese labs that have dominated the open leaderboard.
The details
- Muse Spark Open trails the closed frontier on hard reasoning but ranks ahead of DeepSeek V4 Pro in our overall race.
- The licence allows commercial use with an acceptable-use policy, similar to earlier Llama terms.
- It debuts as the second-ranked open-weights model overall, behind only Kimi K3.
Models in this story
Provenance: Lab announcement; benchmark claims self-reported, early independent results broadly consistent. Illustrative placeholder story.