Meta Muse Spark Open — open weights released

Meta: Meta Muse Spark Open — open weights released, Thursday, October 15, 2026. Ended.

Meta released the open weights of Muse Spark Open, a natively multimodal mixture-of-experts model with 816 billion total parameters (42 billion active per token) and a 1-million-token context window, built for coding and long-running agentic work. Weights ship in BF16 and NVFP4 under the Muse Model License; developers can download, fine-tune, and self-host, or use hosted API endpoints. Two Apple M5 Ultra Mac Studios can run it locally via the MLX framework.

Who’s involved

• Meta (host, organizer)

Tickets and details: www.instagram.com

Last updated 2026-10-16.