Meta Muse Spark Open is live on Together AI

Together AI announced day-one availability of Meta’s Muse Spark Open, an open-weight model designed for long-running agentic coding, computer-use, web automation, and multimodal understanding tasks. Trained on real developer workflows such as multi-file refactors and debugging, the model offers a 1-million-token context window, autonomous planning and self-correction, subagent coordination, tool calling, browser and device interaction, and inputs spanning text, images, audio, and video. Early-access customers Factory and Ollama reported strong performance in tool selection, long-context tasks, structured outputs, and parallel calls, and have made the model available to their users at launch. Muse Spark Open can be accessed through Together AI’s serverless API or playground, with pricing of $1.25 per million input tokens, $4.25 per million output tokens, and $0.15 per million cached input tokens.

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