Muse Spark 1.3 Contributor

This DataCamp hands-on developer tutorial covers Meta's Muse Spark 1.3, released September 2, 2026, explicitly referencing the muse-spark-1.3-contributor default variant in Muse Code. The author installed Muse Code, deliberately broke an open-source project, and ran the same three coding tasks against both 1.3 and 1.2. The tutorial surfaces variant-specific behavior for muse-spark-1.3-contributor: it ships as the default in Muse Code with training-on-code enabled by default (opt-out, not opt-in), a 1,048,576-token context window, multimodal inputs (text, images, video, files), and an ultra reasoning level exposed in the CLI and in-se

This Coursiv blog post covers Meta's Muse Spark 1.3 launch on September 2, 2026, describing it as a proprietary, closed-weights multimodal reasoning model available immediately in Muse Code and through the Meta Model API as a drop-in upgrade (change the model ID; endpoints, SDKs, and prices unchanged). The model accept The post details reasoning-tier availability and a notable pricing policy: the cheapest rate of $0.10 per million input tokens comes with permission for Meta to use prompts and outputs for model improvement and carries lower service limits. Prior reasoning settings including xhigh work with 1.3, while the max reasoning

OpenRouter's models index confirms that Meta's Muse Spark 1.3 Contributor is now listed on the platform, dated Sep 2, 2026. The model is offered at $0.10 per million input tokens and $0.20 per million output tokens with a 1.05M token context window, an 18+ rating, and 285M tokens observed since listing. It is positione The Muse Spark 1.3 Contributor is designed to track information across extended tasks, handle conflicting inputs, and request clarification or confirmation when needed, with an emphasis on concise execution, according to the catalog description. For cost comparison, the base Muse Spark 1.3 is co-listed on the same page