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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 Muse?

Meta Muse is a personal AI agent designed to take action across websites, apps, and everyday digital workflows on behalf of the user. Rather than functioning only as a conversational assistant, Muse can navigate the web, complete forms, book appointments, interact with customer service, and perform other multi-step tasks. It operates on a persistent dedicated virtual machine with its own browser, giving the agent an environment where it can continue working after a task has been assigned. Users can talk to Muse through the dedicated mobile app or through WhatsApp in a conversational format similar to ordinary messaging. The agent can connect to services such as email, calendars, Instagram, and other applications that are relevant to a user’s goals and routines. When given a broader objective, Muse can create an action plan, monitor progress, and return with suggestions or next steps as the situation develops. It can also build its own tools when a task requires functionality that is not already available through an existing integration. User control is built into the workflow through approval requirements for sensitive actions such as sending messages or making purchases. Muse maintains an audit trail that shows what the agent has completed and what it intends to do next. Security features include protected credential storage that the agent cannot directly read, planned 1Password integration, and one-time payment card numbers designed to reduce exposure of real card information during purchases. Meta Muse is intended for users who want a persistent AI agent that can coordinate personal tasks, work across digital services, and act autonomously within boundaries defined by the user.

Media

Media

Integrations Supported

Baseten
Fireworks AI
Hugging Face
Nebius
OpenRouter
Together AI

Integrations Supported

1Password
Box
Canva
Dropbox
Google Docs
Instagram
Meta Ads
Muse Spark 1.3
Muse Wonder Full
OpenTable
Stripe
Ticketmaster
Tincan
WhatsApp

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
Free Version

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Mac

Customer Service / Support

Not specified

Customer Service / Support

Web-Based Support

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/muse/

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

Categories and Features

AI Agents

Not specified

AI Assistants

Not specified

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