Muse Spark Open
Muse Spark Open is Meta’s open-weight Muse Spark model, released on October 15, 2026 with a 1M-token context window.
- Lab
- Meta
- Release date
- Status
- Generally available
- Context window
- 1,000,000 tokens
Meta Superintelligence Labs released Muse Spark Open on October 15, 2026, calling it the most capable US open-weight model to date. Meta describes it as natively multimodal with a 1M-token context window. The weights are available on Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden and Microsoft Foundry Models, and hosted APIs are offered by Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI. Meta said the model met the release thresholds of its scaling framework and that a full evaluation report is coming. Meta did not list an API model ID.
- Modalities
- Natively multimodal
- Availability
- Open weights on Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden and Microsoft Foundry Models; hosted by Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI.
- Official source
- research.meta.ai
- Last checked
Questions
When was Muse Spark Open released?
Where can I download Muse Spark Open?
What is the Muse Spark Open context window?
Source
Release dates, model IDs and limits come from each lab’s own announcement, changelog, documentation or deprecations page, linked on every model with the date it was last checked. How we pick and check sources: editorial standards.