Muse Spark Open

No priced offering is listed for this model yet.

Knowledge cutoff

Jan 4, 2026

Family

muse-spark-open

Not stated on Meta’s pages: max input, reasoning efforts, reasoning can be off, max thinking budget, built-in tools, aliases.

• Epoch Capabilities Index 155.4

  #39 of 118 listed models · CI 153.5–157.6

• LMArena WebDev 1,526

  #46 of 94 listed models · max effort · CI 1,511–1,542 · 1,721 votes

• Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Nov 5, 2026
• LMArena (Arena), leaderboard-dataset on Hugging Face, licensed CC BY 4.0 · License · as of Oct 28, 2026
• changes we made

• Oct 15, 2026Release Meta releases Muse Spark Open weights Meta released the open weights for Muse Spark Open, an 816B-parameter multimodal model with a 1M-token context window. It is available today through Hugging Face and API platforms including Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI.

1. Oct 15, 2026 New language model

• Introducing Muse Spark Open, The Most Capable US Open‑Weight Model to Date | Meta AI Research (opens in a new tab) research.meta.ai · checked Nov 1, 2026
• Build with Meta Model API and Muse Code (opens in a new tab) dev.meta.ai · checked Nov 5, 2026
• Build with Muse Spark Open (opens in a new tab) dev.meta.ai · checked Oct 26, 2026
• Meta Model API models (opens in a new tab) dev.meta.ai · checked Nov 1, 2026
• models.dev: meta/muse-spark-open (community data, MIT) (opens in a new tab) github.com · checked Oct 15, 2026

Meta’s official policies: data use, privacy, terms →

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Snapshots, the same family and other models from this provider

• Muse Wonder
• Muse Wonder Full
• Muse Spark 1.3
• Muse Spark 1.2
• Muse Spark 1.2 Contributor
• Muse Spark 1.1
• Llama-2-7b-chat
• Llama-3.1-70B-Instruct