Muse Spark Open
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What is Muse Spark Open?
Muse Spark Open is a large-scale open-weight artificial intelligence model developed by Meta for multimodal understanding, software engineering, autonomous agents, and long-horizon reasoning. Released in October 2026, the model provides downloadable weights that allow developers to deploy and customize it outside Meta's hosted AI services. It uses a mixture-of-experts architecture containing 816 billion total parameters, with approximately 42 billion parameters activated during inference. Its one-million-token context window supports processing extensive documents, large software repositories, and lengthy sequences of instructions and interactions. The model is designed for complex coding workflows involving source code analysis, debugging, feature implementation, application development, and software testing. Its multimodal capabilities enable AI agents to interpret visual information and combine that understanding with reasoning and automated computer interactions. Meta demonstrated the model performing local software development tasks and controlling DaVinci Resolve to analyze video footage and prepare edited content. Muse Spark Open supports on-device deployment using two Apple M5 Ultra Mac Studio computers running the MLX framework, with additional compatibility across AMD, Intel, and NVIDIA hardware. Supported inference frameworks include SGLang, vLLM, TensorRT-LLM, Hugging Face Transformers, llama.cpp, and Unsloth, with optimized GPU kernels for improved processing performance. Developers can customize the model using PyTorch and TorchTitan to adapt its behavior to specialized tasks, organizational requirements, and application workflows. Muse Spark Open is distributed under the Muse Model License with limited commercial terms and is available through Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden, Microsoft Foundry Models, and several hosted API providers.
What is Llama 4 Behemoth?
Meta’s Llama 4 Behemoth is an advanced multimodal AI model that boasts 288 billion active parameters, making it one of the most powerful models in the world. It outperforms other leading models like GPT-4.5 and Gemini 2.0 Pro on numerous STEM-focused benchmarks, showcasing exceptional skills in math, reasoning, and image understanding. As the teacher model behind Llama 4 Scout and Llama 4 Maverick, Llama 4 Behemoth drives major advancements in model distillation, improving both efficiency and performance. Currently still in training, Behemoth is expected to redefine AI intelligence and multimodal processing once fully deployed.
Integrations Supported
Groq
OpenRouter
C
C++
CSS
Clojure
Go
Julia
LaunchLemonade
Llama
API Availability
API Availability
Pricing Information
$0
Model weights are available at no charge under the Muse Model License, which has limited commercial-use terms. Hosted inference providers set their own usage prices.
Free Version
Pricing Information
Free
Open source
Free Version
Supported Platforms
SaaS
Windows
Mac
On-Prem
Linux
Supported Platforms
SaaS
Windows
Mac
On-Prem
Linux
Customer Service / Support
Not specified
Customer Service / Support
Not specified
Training Options
Documentation Hub
Training Options
Documentation Hub
Company Facts
Organization Name
Meta
Date Founded
2004
Company Location
United States
Company Website
research.meta.ai/blog/muse-spark-open
Company Facts
Organization Name
Meta
Date Founded
2004
Company Location
United States
Company Website
ai.meta.com
Categories and Features
AI Coding Models
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AI Models
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AI Reasoning Models
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AI Receptionists
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Foundation Models
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Large Language Models
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Multimodal Models
Not specified
Open-Weight AI Models
Not specified
Categories and Features
AI Models
Not specified
AI Reasoning Models
Not specified
Foundation Models
Not specified
Large Language Models
Not specified
Multimodal Models
Not specified
