# Meta Releases Muse Spark Open: 816B Open-Weight MoE With 1M Context

> Source: <https://www.marktechpost.com/2026/10/15/meta-muse-spark-open-816b-open-weight-model/>
> Published: 2026-10-16 02:26:04+00:00

Meta released Muse Spark Open, an 816B-parameter open-weight MoE model with 42B active parameters and a 1M-token context. It leads open models on MCP-Atlas and runs on 2 M5 Ultra Mac Studios.

The post [Meta Releases Muse Spark Open: 816B Open-Weight MoE With 1M Context](https://www.marktechpost.com/2026/10/15/meta-muse-spark-open-816b-open-weight-model/) appeared first on [MarkTechPost](https://www.marktechpost.com).