Scale AI launches muse spark open: 816B-param MoE with 1M context, billed as top US open-weight model
jiayi_pirate · x · 2026-10-16
Scale AI CEO Alexandr Wang announced muse spark open, billed as the most capable US open-weight model to date.
Key specs: 816B total params with 42B active (MoE), 1M-token context, natively multimodal, and built for coding and agentic work — long-horizon tasks, hard software engineering, multi-step reasoning. Former OpenAI researcher Tianhe Yu says the model is decent at long-horizon coding and agentic tasks and frames it as a return to open-sourcing.
Related event: Meta Open-Sources Muse Spark Open, Its Strongest US Open-Weights Model(62 posts)→
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