Pyyan / Compare / GLM-5.3 vs Muse Spark Open
GLM-5.3 vs Muse Spark Open
2 of 5Open-Weight Models · verified 20 Oct 2026
GLM-5.3Zhipu AIcurrentMuse Spark OpenMetacurrent
| Specification | GLM-5.3 | Muse Spark Open |
|---|---|---|
| Summary | Post-trained from the GLM-5.2 base, with the weights following two weeks later. | The largest American open weights, under a licence with a revenue trigger. |
| Context | 1M | 1M |
| Input ($/Mtok) | $1.4 | Weights only |
| Output ($/Mtok) | $4.4 | Weights only |
| Licence | Open weights | Muse Model License |
| Max output | 32K | Not published |
| Parameters | Not published | 816B total, 42B active |
| Released | 14 Aug 2026, weights 27 Aug | 15 Oct 2026 |
| Model ID | zai-org/GLM-5.3 | meta-models/Muse-Spark-Open-816B-A42B |
| Category | Open-Weight Models | Open-Weight Models |
| Official | — | Meta ↗ |
Highlighted rows are where these differ.
GLM-5.3
- Post-trained from the GLM-5.2 base rather than trained from scratch
- $1.40 in and $4.40 out per million tokens, with a 1M token window
- Announced 14 August, weights published 27 August
Best for the full-size open flagship.
Muse Spark Open
- Text, image, video and audio in, text out, with a 1M token context
- Muse Model License, not open source: attribution required, and a separate agreement above $20m of model-service revenue
- About 1.5TB in BF16, or two Mac Studios at 4-bit
Best for multimodal work you host yourself.