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.

Context

1M

Max output

131.07K

Knowledge cutoff

Jan 4, 2026

Meta Superintelligence Labs research ↗

Source: Meta Superintelligence Labs research, checked Oct 15, 2026. Summarized from the provider’s announcement.