# Meta's Muse Spark Marks a Break From Llama, and From Open Weights

Superintelligence Labs' first model is natively multimodal with a parallel sub-agent reasoning mode, and it is closed source.

- Published: 2026-06-21T10:59:22.601Z
- Canonical: https://polylog.news/ai/2026-06-21/meta-s-muse-spark-marks-a-break-from-llama-and-from-open-wei
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Meta AI](https://ai.meta.com/blog/introducing-muse-spark-msl/)

Meta Superintelligence Labs (MSL) has described Muse Spark, the division's first model and the system now running the Meta AI assistant. It was rebuilt entirely over roughly nine months on a new technical stack, a departure from Meta's Llam…

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