In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- Muse Spark Open reads more at once: a context window of 1M tokens against 131K.
- Both can be downloaded and run on your own machine.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| Muse Glimmer | Muse Spark Open | |
|---|---|---|
| Made by | Meta · US | Meta · US |
| Released | Aug 2026 | Oct 15, 2026 |
| Price per 1M tokens | Free to download; hosts set prices | Free to download; hosts set prices |
| Context window | 131K | 1M |
| Takes in | text, image | text, image, video, audio |
| Download and run it yourself | Yes (Apache 2.0) | Yes (Muse Model License) |
| Size | ~29.6B (dense; repo header says 30B) parameters | 816B parameters, 42B active |
| Maker says | “Built to enable always-on, local agents, available on Hugging Face.” | “The most capable US open-weight model to date. Build your way, anywhere.” |
| Sources | Prices, Oct 20, 2026 · Description | Prices, Oct 20, 2026 · Description |
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