Muse Spark Open Overview
Meta AI releases Muse Spark Open today, the most capable US open-weight model to date. A native multimodal architecture with 816B total parameters (42B active) and a 1M-token context window, it is purpose-built for coding and agentic workflows.
The model achieves its first fully on-device inference on Apple M5 Ultra Mac Studios using the MLX framework. Two machines with unified memory architecture deliver supercomputer-level performance through up to 512 GB per studio and 1.2 TB/s bandwidth.
Real-world agentic workflows demonstrate the model: it shipped full iOS changes to Ice Cubes (an open-source Mastodon client) including bug fixes, new features, and a complete build, and end-to-end drove DaVinci Resolve with frame-by-frame footage review and vertical cropping.
Key Benchmarks and Safety Evaluation
The model meets the thresholds of the Meta Superintelligence Scaling Framework across severe risk categories. The open-weight version includes additional safety post-training. Weights are available for download today via Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden, and Microsoft Foundry Models.
“We believe the future is for everyone, and that includes the freedom to run advanced models wherever, including at home.”