Meta announced Muse Spark Open, its first open-weight release from the Muse Spark series, on October 15, 2026. The multimodal model features 816 billion total parameters with 42 billion active, and includes a 1M-token context window supporting image, video, and audio inputs. Arena.ai confirmed the integration and live testing launch. The model is accessible via API platforms including Baseten and Fireworks AI, with model weights available through Amazon SageMaker and Google Cloud Model Garden.

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