Meta’s Muse Spark Open lands in Arena for public testing

Meta's first open-weight Muse Spark model is now live in Agent Arena and Code Arena, where it will be scored on complex coding and agentic tasks Meta ’s newest AI model is now in front of the toughest audience in tech: other developers. Muse Spark Open, the first open-weight release from Meta’s Muse Spark series, is now available in Arena.ai’s Agent Arena and Code Arena. There, users can test it on complex tasks and score how it actually performs. Meta announced the model on October 15, 2026. Arena.ai confirmed the integration and live testing on launch day. Muse Spark Open is a multimodal model with 816 billion total parameters. Of those, 42 billion are active. The model also comes with a 1M-token context window.

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