AI at Meta: ‘Today we’re releasing Muse Spark Open, the most capable US open-weight model to date’
AI at Meta @AIatMetaX
Why it matters
Official launch thread with the model specs (816B total / 42B active, 1M context, natively multimodal); ~767k views.
Summary
Official launch thread: built for coding and agentic work; 816B total / 42B active parameters, 1M-token context, natively multimodal across text, image, video and audio. A follow-up post says it is optimised to run on two Apple M5 Ultra Mac Studios with MLX and on SGLang, vLLM, TensorRT-LLM, Transformers, llama.cpp and Unsloth (~83k views). ~767k views on the main post by Oct 16 morning.
Archived text
Today we’re releasing Muse Spark Open, the most capable US open-weight model to date.
Built for coding and agentic work, it excels at long-horizon tasks, complex software engineering, and multi-step reasoning.
Key Model Specs: → 816B total / 42B active parameters → 1M token context window → Natively multimodal across text, image, video, audio
