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TLDRocket
15 October 2026
Meta used today’s open-weight model drop to make a point: “frontier” doesn’t have to stay in the datacenter. Muse Spark Open ships as an 816B multimodal model with a 1 million–token context window, paired with Muse Code for coding and agent-style workflows—and it comes with strings. The license is free for use and fine-tuning, but it adds revenue-linked conditions (including advance notice above $20 million) and asks developers to display “Built with Muse Spark Open.” Running locally is a hardware project in itself: Meta says you need about 1TB of RAM. Still, the rollout is broad—Meta is making it available via multiple API platforms for desktop-focused tasks, and now through Amazon SageMaker JumpStart for deploy-to-your-own-AWS-account use, including BF16 and a 4-bit NVFP4 variant.
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