Meta says it is releasing Muse Spark Open, which it calls the most capable US open-weight model to date. The model is built for coding and agentic work, including long-horizon tasks, complex software engineering, and multi-step reasoning. It has 816B total parameters with 42B active, a 1M token context window, and native support for text, image, video, and audio.
The post gives the parameter count, context window, and modalities for a US open-weight model aimed at coding and agentic work, useful for comparing it with other open models.
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
Source: AI at Meta · x.comPublished · added here
