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Muse Spark Open

Muse Spark Open is the most capable open-weight model from a US lab, and is part of our commitment to giving developers control over how and where they choose to build.

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Where to deploy Muse Spark Open

Meet Muse Spark Open

Enhanced coding capabilities

Muse Spark Open writes, reviews and ships code with fewer steps and lower latency. Whether you're building coding agents or using AI as a development partner, it's competitive with the best.

Native multimodal perception

Muse Spark Open perceives video, images, and documents, and its visual reasoning runs through a real execution environment instead of scripted steps. Feed it a screenshot or a clip and let it build, so you can focus on shipping features fast.

End-to-end agentic workflows

Build and orchestrate multi-agent workflows with one model. Move from idea to feature quickly and spend time testing, learning, and building instead of configuring. A separate commentary channel lets the model state intent before acting – so you always know what it's doing and why.

Muse Spark

Introducing Muse Spark Open

Muse Spark Open is derived from the Muse Spark model we released in August, with additional safety post-training to make it more robust against misuse as a standalone model without system guardrails.