# Muse Spark Open: Open weights

Muse Spark Open: Open weights (15 Oct 2026). Its weights are publicly available. The context window is 1,048,576 tokens. 12 evidence links.

- Kind: Launch
- Developer: Meta
- Confidence: Supported
- First seen: 2026-10-15T16:55:52.839Z
- Released: 2026-10-15T00:00:00.000Z
- Model: [Muse Spark Open](https://alexgetman.com/models/meta/muse-spark-open/)
- Canonical: https://alexgetman.com/signals/2026/10/15/muse-spark-open-3/

## Evidence links

- [Hugging Face · meta-models](https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B)
- [Hugging Face · meta-models](https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4)
- [OpenRouter](https://openrouter.ai/meta/muse-spark-open)
- [Vertex AI · Model Garden](https://console.cloud.google.com/vertex-ai/publishers/meta/model-garden/muse-spark-open)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [Hacker News · front page](https://research.meta.ai/blog/muse-spark-open)
- [models.dev · catalogue](https://models.dev/#muse-spark-open)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)
- [OpenCode · discovery](https://opencode.ai/data/meta/muse-spark-open)
- [Command Code · models](https://commandcode.ai/docs/reference/cli/models)
- [models.dev · catalogue](https://models.dev/#Muse-Spark-Open-816B-A42B)
- [DesignArena · website](https://www.designarena.ai/leaderboard/website)