Meta officially launches Muse Spark Open: 816B total, 42B active, 1M context
airesearch12 · x · 2026-10-16
Meta's official @AIatMeta account announced Muse Spark Open, claimed as the most capable US open-weight model, built for coding and agentic work: 816B total / 42B active parameters, 1M-token context, natively multimodal across text, image, video, and audio. The shared benchmark table shows it leading Inkling, Nemotron 3 Ultra, GLM 5.3, and Kimi K3 on JobBench (61.8), MCP-Atlas (89.2), HLE-Diamond (26.1), AA-Omniscience (25), and ZeroBench (50.0), though it trails GLM 5.3 (1653) and Kimi K3 (1537) on GDPval-AA v2 and Kimi K3 (85.0) on Terminal-Bench 2.1.
Related event: Meta Open-Sources Muse Spark Open with 816B Parameters and 1M Context(39 posts)→
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