Muse Spark Open
Muse Spark Open is a coding-optimized open-weight model.
Specifications
| Lab | Meta |
|---|---|
| Context window | 1M tokens |
| Input price | $1.25/1M |
| Output price | $4.25/1M |
| Release | Oct 2026 |
Strengths
- Open-weight 816B MoE (42B active) for agentic coding
- 1M-token context for large codebases
- Adjustable reasoning effort up to xhigh
- Multimodal input across images, video, audio, and files
Weaknesses
- New listing with limited independent benchmark coverage
- Premium output pricing for an open-weight model
Best for
- Agentic coding workflows
- Self-hosted open-weight coding agents
- Large codebase analysis
In Depth: Muse Spark Open
Summary
Muse Spark Open is an AI model from Meta.
Released in Oct 2026. It takes text, image, video, file, and audio input and produces text output, with a context window of 1M tokens. Input pricing is $1.25 per 1M tokens and output is $4.25 per 1M tokens on OpenRouter.