Meta launches Muse Wonder and releases open-weight Muse Spark Open
Meta introduced Muse Wonder and Muse Wonder Full for agent work on October 12, then released the weights of Muse Spark Open, an 816B-parameter model it says runs on two Mac Studios, on October 15.
What happened
- October 12: Meta introduced Muse Wonder and Muse Wonder Full, which it describes as its most capable models for personal and professional agent tasks. Muse Wonder is available through the Meta Model API and Muse Code; Muse Wonder Full is available to Muse Code subscribers.
- October 15: Meta released the weights of Muse Spark Open, a natively multimodal model with 816B total parameters (42B active) and a 1M-token context window, built for coding and agentic work.
- Meta says Muse Spark Open runs on two Apple M5 Ultra Mac Studios with MLX. Weights are on Hugging Face and other model hubs, and hosted APIs are offered by partners such as OpenRouter and Together AI.
- The weights use the Muse Model License, which Meta describes as having limited commercial terms.
Why it matters: Agent builders get a new hosted model to compare, and anyone who wants to run a strong model locally gets a new option. Read the Muse Model License before using Muse Spark Open in a product.
Sources
- Meta: Muse Wonder research.meta.ai
- Meta: Muse Spark Open research.meta.ai
Checked October 17, 2026 against the sources above. Claims about performance or benchmarks are the company's own unless stated otherwise.