Musespark-1.3
#20 in Open-Source LLMsMusespark · v1.3 · 3× · last seen Sep 16, 2026
36
Momentum
Musespark-1.3 (officially "Muse Spark 1.3") is a multimodal Reasoning model by Meta, released on September 2, 2026, and designed for agentic and Coding workflows. It is available via the Meta Model API and the Muse-Code-CLI, supports a context window of 1 Million Token, and processes text, images, video, and documents as input. Contrary to some assumptions, the model is proprietary with undisclosed weights; a separate open model (Muse Glimmer) exists under Apache-2.0 license, while Meta has only announced a future open weights release of Muse Spark itself without a specific date or license.
Momentum trend
18.06.16.09.
Features
| Key Benchmark (%) | Artificial Analysis Intelligence Index: 61 (xhigh variant), 62 (max variant, limited preview) |
| Context Window (Tokens) | 1,048,576 tokens (~1M) |
| License | Proprietary, model weights not publicly available (not an open-source model) |
| Multimodality | Input: text, images, video, documents (e.g. PDF); output: text |
| Platform | Available via Muse Code (CLI) and Meta Model API |
| Price per 1M Tokens | $1.25 input / $4.25 output (standard xhigh tier); $0.10/$0.20 (contributor tier) |
| Release Date | September 2, 2026 |