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 Arcee AI?
Arcee AI is a leading open intelligence lab dedicated to developing scalable, high-performance AI models with an emphasis on transparency and accessibility. Based in the United States, the company focuses on creating open-weight AI systems that empower developers and organizations to build advanced applications. Its flagship Trinity model family demonstrates strong capabilities in reasoning, multi-step problem solving, and agent-based workflows. Arcee AI incorporates online reinforcement learning techniques, enabling its models to continuously improve and adapt after deployment. The company prioritizes cost efficiency, ensuring that users can achieve frontier-level performance without incurring excessive operational expenses. Its models are designed to support complex use cases, including enterprise automation, research, and intelligent assistants. Arcee AI provides a robust ecosystem of tools, APIs, and documentation to facilitate easy integration and customization. The open-weight approach allows developers to maintain control over their AI systems and tailor them to specific requirements. The company collaborates with major technology partners to enhance its capabilities and reach. Its focus on scalability ensures that solutions can grow alongside user needs. Arcee AI is committed to making advanced AI more practical and widely available. Overall, it represents a new generation of AI development focused on openness, performance, and real-world impact.
Integrations Supported
Baseten
Fireworks AI
Groq
Hugging Face
Modal
Nebius
OpenRouter
Together AI
vLLM
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
Pricing not provided
Supported Platforms
SaaS
Windows
Mac
On-Prem
Linux
Supported Platforms
SaaS
Customer Service / Support
Not specified
Customer Service / Support
Web-Based Support
Training Options
Documentation Hub
Training Options
Online Training
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
Arcee AI
Date Founded
2023
Company Location
United States
Company Website
www.arcee.ai/
Categories and Features
AI Coding Models
Not specified
AI Models
Not specified
AI Reasoning Models
Not specified
AI Receptionists
Not specified
Foundation Models
Not specified
Large Language Models
Not specified
Multimodal Models
Not specified
Open-Weight AI Models
Not specified