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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 Claude Mythos 5.1?

Claude Mythos 5.1 signifies the latest evolution in the Mythos series of models developed by Anthropic, specifically designed for advanced applications across fields such as cybersecurity, biology, scientific research, programming, and extensive knowledge-intensive tasks. Although it is built on the same core architecture as Claude Fable 5.1, it stands out due to its distinct safety protocols: while Fable 5.1 is broadly available, Mythos 5.1 is restricted to select trusted access initiatives that incorporate specialized safeguards for cybersecurity and life sciences. This model sets a new standard for performance in autonomous coding and exhibits unmatched cyber capabilities compared to all previous Anthropic models. In the scientific research domain, Mythos 5.1 adeptly manages specialized tools and complex workflows related to molecular design, computational biology, and other technical disciplines. During Anthropic's evaluation, it successfully designed high-affinity protein binders for various targets, achieving its highest hit rate to date. Furthermore, it excelled in optimizing seven distinct open-source deep learning models that focus on protein and genomics. By advancing the limits of what can be accomplished, Mythos 5.1 is poised to play a pivotal role in shaping future research and development projects, ultimately influencing a wide array of scientific inquiries and technological innovations. Its capabilities suggest a transformative impact on how complex biological and computational problems are approached in the coming years.

Media

Media

Integrations Supported

Groq
OpenRouter

Integrations Supported

Amazon Bedrock
Bind AI
Bolt.new
Claude Cowork
Claude Pro
Doraverse
Elixir
Emergent
Gemini Enterprise Agent Platform
JavaScript
Perplexity Pro
PhpStorm
Pi Agent
Revise
Rust
Simtheory
Solidity
Viktor

API Availability

API Availability

Has API

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

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

Anthropic

Date Founded

2021

Company Location

United States

Company Website

claude.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

Categories and Features

AI Coding Models

Not specified

AI Models

Not specified

AI Reasoning Models

Not specified

AI Vision Models

Not specified

Foundation Models

Not specified

Large Language Models

Not specified

Multimodal Models

Not specified

Popular Alternatives

Popular Alternatives

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