Meta's Muse Spark Open: 816B/A42B, 1M context, top US open-weight model
alexandr_wang · x · 2026-10-16
Meta Chief AI Officer Alexandr Wang says Muse Spark Open is the most capable US open-weight model to date: 816B total/42B active params, 1M-token context, natively multimodal, built for coding and long-horizon agentic work. The benchmark chart shows leads on JobBench (61.8), MCP-Atlas (89.2), HLE-Diamond (26.1) and ZeroBench (50.0), though it trails GLM 5.3 and Kimi K3 on GDPval-AA v2 and coding benchmarks.
Related event: Scale CEO Unveils Muse Spark Open as Top US Open-Weight Model(3 posts)→
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