Meta releases Muse Spark Open, saying it is the most capable US open-weight model, with 816B total and 42B active parameters and a 1M-token context window (Meta AI Research)
Muse Spark Open can run locally on two Apple M5 Ultra Mac Studios, Meta says.
Meta optimized the model for Apple’s MLX framework and built it for coding, long-running agent tasks and multi-step reasoning. It also supports inference engines including vLLM, SGLang and llama.cpp. Weights are available to download, with hosted access through providers including Fireworks AI, Groq and Together AI. The release uses a Meta Muse Open License, which drew criticism in the note’s linked reactions over branding, revenue and use restrictions.
Techmeme's note
Meta optimized the model for Apple’s MLX framework and built it for coding, long-running agent tasks and multi-step reasoning. It also supports inference engines including vLLM, SGLang and llama.cpp. Weights are available to download, with hosted access through providers including Fireworks AI, Groq and Together AI. The release uses a Meta Muse Open License, which drew criticism in the note’s linked reactions over branding, revenue and use restrictions.
Techmeme's note
score 9