# Hugging Face — Welcome Muse Spark Open: open-weight frontier multimodal mixture-of-experts model from Meta

- Company: Hugging Face (huggingface.co)
- Announced: 2026-10-15
- Category: open-weight-release
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://huggingface.co/blog/meta-muse-spark-open
- Record: https://forck.live/items/23000-welcome-muse-spark-open-open-weight-frontier-multimodal-mixture-of-experts
- Subject: Platform
- Open weights: yes
- Models affected: Muse Spark Open, Muse Glimmer
- Context window: 1M tokens at inference

Meta released Muse Spark Open, an open-weight multimodal mixture-of-experts model with approximately 816 billion total parameters and around 42 billion active per token. The model accepts text, images, audio, and video as input, generates text, and is optimized for agentic coding tasks such as reading codebases, writing and debugging code, and calling tools. It has a context window of up to one million tokens and uses a mixture-of-experts architecture with 256 experts, selecting 8 per token.

## Evidence

Verbatim from https://huggingface.co/blog/meta-muse-spark-open:

> Muse Spark Open is an open-weight model from Meta. The mixture of experts model brings text, images, audio, and video into a model with approximately 816 billion parameters, around 42 billion active per token, and a context window of up to one million tokens.

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Record: https://forck.live/items/23000-welcome-muse-spark-open-open-weight-frontier-multimodal-mixture-of-experts
Catalogue: https://forck.live/llms.txt
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