Muse Spark Open 🆕 New
Meta’s new open-weight model (Oct 15) · 816B MoE with 42B active · 1M context · AA Intelligence Index 39 · Muse Model License (commercial use with limits).
What is Muse Spark Open?
Muse Spark Open is Meta’s open-weight language model, released on October 15, 2026. It is a mixture-of-experts model with 816 billion parameters, 42 billion of them active per token, and a 1 million-token context window. The weights are free to download under Meta’s Muse Model License, which allows commercial use with some limits; it succeeds Llama 4 Maverick as Meta’s main open model.
Best for
- Self-hosting a large open model with long context
- Fine-tuning on your own data
- Agentic and research tasks without per-token fees
Muse Spark Open pricing
Muse Spark Open has a free tier. Price: Free (open weights); API access costs from $1.25/$4.25 per 1M.
Plans & prices
- Free weights (Muse Model License)
- hosted API from $1.25/$4.25 per 1M
Looking for something cheaper? MiMo-V2.6-Pro by Xiaomi costs Free (open weights) · $0.44/$0.87 per 1M.
Prices as published by Meta. This page was last updated on October 19, 2026; prices and plans change often, so check the provider’s pricing page before you buy.
Check current Muse Spark Open prices →At a glance
Key facts
- Meta’s new open-weight model (Oct 15)
- 816B MoE with 42B active
- 1M context
- AA Intelligence Index 39
- Muse Model License (commercial use with limits)
Capability ratings
AIVerso capability ratings (0–100), an editorial summary informed by public benchmark results. Higher is better.
Strengths
Limitations
Best alternatives to Muse Spark Open
🔗 Comparisons & guides
❓ Frequently Asked Questions
What is Muse Spark Open?
Muse Spark Open is Meta’s open-weight language model, released on October 15, 2026. It is a mixture-of-experts model with 816 billion parameters, 42 billion of them active per token, and a 1 million-token context window. The weights are free to download under Meta’s Muse Model License, which allows commercial use with some limits; it succeeds Llama 4 Maverick as Meta’s main open model.
What is Muse Spark Open best for?
Muse Spark Open is a strong pick for: Self-hosting a large open model with long context; Fine-tuning on your own data; Agentic and research tasks without per-token fees.
How much does Muse Spark Open cost?
Muse Spark Open starts at Free (open weights) (Free weights (Muse Model License) · hosted API from $1.25/$4.25 per 1M). A free tier is available. A cheaper option from another provider is MiMo-V2.6-Pro (Free (open weights) · $0.44/$0.87 per 1M).
Is Muse Spark Open free?
Yes — Muse Spark Open has a free tier. Pricing: Free (open weights) (details: Free weights (Muse Model License) · hosted API from $1.25/$4.25 per 1M).
What are the best alternatives to Muse Spark Open?
The highest-rated AI chatbots & text models from other providers on AIVerso are Claude Opus 5.5 (99/100), GPT-6 Astra (98/100), Fugu Ultra v2 (97/100).
Does Muse Spark Open have an API?
Yes, Muse Spark Open can be used via an API.
Is Muse Spark Open open source?
Yes — Muse Spark Open is available as open source / open weights, so it can be self-hosted.
How does AIVerso rate Muse Spark Open?
Muse Spark Open scores 88/100 on AIVerso and ranks #18 of 43 in Text & Chat. Scores combine public benchmark results, features and pricing; commissions never influence them.
How we rate: Scores and capability ratings are based on public benchmarks, provider documentation, features and pricing — not on commission rates. Prices can change; check the provider's site before buying. Last updated: October 19, 2026.