In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- Both can be downloaded and run on your own machine.
- On the 2 independent boards that rank both, each places higher on 1.
Side by side
The specs.
| GLM-5.3 | Muse Spark Open | |
|---|---|---|
| Made by | Z.ai (Zhipu AI) · China | Meta · US |
| Released | Not stated | Oct 15, 2026 |
| Price per 1M tokens | $1.40 in / $4.40 out | Free to download; hosts set prices |
| Context window | 1M | 1M |
| Takes in | text | text, image, video, audio |
| Download and run it yourself | Yes (glm-5.3 (license tag shown on Hugging Face)) | Yes (Muse Model License) |
| Size | 753B (Hugging Face safetensors size field) parameters | 816B parameters, 42B active |
| Maker says | “GLM-5.3 is Z.ai's latest flagship model, delivering comprehensive advancements in complex software engineering” | “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