Release dates
— Meta released Muse Spark Open weights. Its official model card lists BF16 and NVFP4 checkpoints, 816B total / 42B active parameters, and 1M context; the model uses the Muse Model License. ↗
Muse Spark Open
A full-size multimodal MoE open-weight model in the Muse family, with 816B total / 42B active parameters, 1M context, and text, image, audio, and video input.
Meta released the weights on 2026-10-15; BF16 and NVFP4 checkpoints are available to download, and Meta lists hosted inference partners. The weights use the Muse Model License with usage conditions.
MODEL NUMBER261
- First public date
- 2026-10-15
- Organization
- Meta
- Family
- Muse
01
Specifications
Only published specifications are shown.
02
Overview
Why it mattered
Muse Spark Open extends Meta’s Muse line with downloadable full-size MoE checkpoints and local deployment and fine-tuning paths; no direct weight inheritance from Muse Spark 1.3 is inferred.
03
Architecture & capabilities
Model capabilities
ReasoningCodingTool useLong contextLong-horizon agentVision
04
Release history
Meta released Muse Spark Open weights. Its official model card lists BF16 and NVFP4 checkpoints, 816B total / 42B active parameters, and 1M context; the model uses the Muse Model License.
View source05
Related models
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06
Sources
01
Introducing Muse Spark OpenMeta AI Research · Published 2026-10-15 · Checked 2026-10-15
Official · Verified02Muse Spark Open model cardMeta (official Hugging Face model repository) · Checked 2026-10-15
Official · Verified03Muse Spark Open licenseMeta (official Hugging Face model repository) · Checked 2026-10-15
Official · VerifiedSuggest a correction
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