Meta launches Muse Spark Open with weights and 7 inference providers

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Muse Spark now has an open-weight version you can download or access through hosted inference. Meta launched Muse Spark Open with weights on Hugging Face and hosted options from seven providers, so you can evaluate it without first setting up a self-hosted deployment.

Here's what ships:

• The 816B-parameter MoE activates 42B parameters per token.
• Text, image, video, and audio inputs share a 1M-token context window.
• BF16 weights take about 1.6TB, while NVFP4 takes about 530GB.
• Serving options include SGLang, vLLM, TensorRT-LLM, Transformers, MLX, llama.cpp, and Unsloth.

One catch: the Muse Model License has limited commercial terms. Hosted access also varies by provider, with Groq in limited preview.

Try it: Download the Hugging Face weights, or use Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter, or Together AI for hosted inference.

Sources: research.meta.ai · dev.meta.ai