Meta has released Muse Spark Open, which NVIDIA AI describes as the most capable US open-weight model to date. The model has 816B total parameters with 42B active, a 1M-token context window, and native support for text, image, video, and audio. Meta also published NVFP4 checkpoints optimized for Blackwell Ultra, which NVIDIA says deliver over 50K tokens/sec/GPU.
And @AIatMeta went live with Muse Spark Open!
The 816B model was trained on NVIDIA GB300 NVL72. Its 1M-token context window gives coding agents room to work across large codebases.
Meta also produced NVFP4 checkpoints optimized for Blackwell Ultra, delivering over 50K tokens/sec/GPU to improve throughput and lower cost per token.
Congrats to the @Muse team.
More in our blog: https://nvda.ws/4B8d9g4
NVFP4: https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B-NVFP4
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
This story is featured in top picks: “Meta releases Muse Spark Open, a 816B open-weight model for coding and agents”
Source: NVIDIA AI · x.comPublished
