Models
Muse Spark Open
Meta
Meta's open-weight MoE model under the Muse licence (not open source), built for coding and agents: 816B parameters (42B active), 1M-token context window (source: Meta, Oct 15, 2026).
- Pricing
- Free weights on Hugging Face; API via Baseten, Fireworks AI, Groq, OpenRouter, Together AI and others (source: research.meta.ai/blog/muse-spark-open).
- License
- Muse Model License, not open source: it requires displaying "Built with Muse Spark Open" in every product that uses it (section 2) and a separate written agreement with Meta to offer it as an API ("Model as a Service") above $20M revenue over 12 months (section 3) (source: huggingface.co/meta-models/Muse-Spark-Open-816B-A42B).
- Updated on
- Platforms
- API, Local
- Open source
- No
- Context window
- 1 million tokens
- Reference model
- Muse Spark Open (816B-A42B)
- Coding score
- 60% DeepSWE v1.1 · Source
- Open weights
- Yes
- Release date
Alternatives
- Claude · Claude vs Muse Spark Open
- GPT · GPT vs Muse Spark Open
- Open-source models · Muse Spark Open vs Open-source models
- MiniMax M3.1 Flash · MiniMax M3.1 Flash vs Muse Spark Open
All Muse Spark Open alternatives (6) →