Meta describes Muse Spark 1.3 as a model for coding agents and other tasks that require sustained work across multiple steps. Its model page lists a million-token context window, support for interpreting images, video and documents, and access through Meta Model API, Muse Code and OpenRouter.
The page separates two API model identifiers. Meta labels muse-spark-1.3-contributor as used to improve its products, while muse-spark-1.3 is labelled as not used for that purpose. The contributor option is cheaper in the displayed pricing table. That distinction concerns the stated product-improvement use; it is not a substitute for the service's complete data-handling terms.
Meta's developer examples cover splitting agent tasks into isolated worktrees, having an agent operate a computer interface, and building a GitHub bot. Its quickstart also describes connecting an OpenAI-compatible SDK client to Meta Model API.