Pyyan / Compare / GLM-5.3-Flash vs Muse Spark Open
GLM-5.3-Flash vs Muse Spark Open
2 of 5Open-Weight Models · verified 20 Oct 2026
GLM-5.3-FlashZhipu AIcurrentMuse Spark OpenMetacurrent
| Specification | GLM-5.3-Flash | Muse Spark Open |
|---|---|---|
| Summary | MIT licensed, a million tokens of context, fifteen cents a million in. | The largest American open weights, under a licence with a revenue trigger. |
| Context | 1M | 1M |
| Input ($/Mtok) | $0.15 | Weights only |
| Output ($/Mtok) | $0.5 | Weights only |
| Licence | MIT | Muse Model License |
| Max output | 32K | Not published |
| Parameters | 320B total, 18B active | 816B total, 42B active |
| Released | 26 Aug 2026 | 15 Oct 2026 |
| Model ID | zai-org/GLM-5.3-Flash | 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-Flash
- MIT licensed, which is about as permissive as an open release gets
- 320B total parameters, 18B active, with a 1M token context
- $0.15 in and $0.50 out per million tokens
Best for permissive licence at scale.
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.