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 256K.
- Both can be downloaded and run on your own machine.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| Mistral Medium 3.5 | Muse Spark Open | |
|---|---|---|
| Made by | Mistral AI · France | Meta · US |
| Released | Apr 28, 2026 | Oct 15, 2026 |
| Price per 1M tokens | $1.50 in / $7.50 out | Free to download; hosts set prices |
| Context window | 256K | 1M |
| Takes in | text, image | text, image, video, audio |
| Download and run it yourself | Yes (Modified MIT) | Yes (Muse Model License) |
| Size | 128B (dense) parameters | 816B parameters, 42B active |
| Maker says | “Our frontier-class multimodal model optimized for agentic and coding use cases.” | “The most capable US open-weight model to date. Build your way, anywhere.” |
| Sources | Prices, Oct 20, 2026 · Description | Prices, Oct 20, 2026 · Description |
Independent tests
Where they place.
Position on each board we follow (1 is best). Epoch AI's and Vectara's scores are shown; the other boards are linked for their own figures.
More comparisons