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Muse Spark Open

research.meta.ai495 points290 comments
Screenshot of Muse Spark Open

Muse Spark Open is an 816-billion-parameter (42B active) natively multimodal model with a 1,000,000‑token context window, built for long‑horizon coding, agentic workflows, and multi‑step reasoning. It is engineered to run on consumer hardware by pairing two Apple M5 Ultra Mac Studios via the MLX stack, leveraging Apple’s unified memory (up to 512 GB per Mac) and 1.2 TB/s memory bandwidth so the pair can hold the full model and stream token slices efficiently. Demonstrated agentic tasks include end‑to‑end iOS app changes and automated video review in DaVinci Resolve; these show on‑device capabilities for complex software engineering and frame‑by‑frame media analysis.

Weights and hosted access are available now across major clouds and platforms (Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden, Microsoft Foundry Models) and through API partners (Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter, Together AI). It runs on common inference engines (SGLang, vLLM, TensorRT‑LLM, HF Transformers, Apple MLX, llama.cpp, Unsloth) and ships with Helion GPU kernels that deliver 1.03-3.95× kernel speedups and a reported 3% end‑to‑end boost on AMD MI350. Safety post‑training met thresholds in Meta’s Superintelligence Scaling Framework; weights are released under the Muse Model License with limited commercial terms. Developers can further customize via PyTorch (TorchTitan) and the MLX adapter for Apple Silicon.

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