Meta’s Muse Spark Open is now available on Amazon SageMaker JumpStart, expanding access to open-weight models for agentic coding and software engineering.
Built on a mixture-of-experts architecture, the model has 816 billion total parameters, with 42 billion active per token. Its one-million-token context window supports large codebases, multi-file refactoring, debugging and long-running development tasks.
The model processes text, images, documents, audio and video inputs while generating text responses. SageMaker JumpStart offers BF16 and NVFP4 variants, with the quantized version requiring less memory. Developers can deploy the model through SageMaker Studio or the Python SDK within their AWS accounts.

