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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 Mercury 3?

Mercury 3 is a cutting-edge generative AI model from Inception, crafted specifically for developers focused on building interactive applications. Utilizing a diffusion-based approach, it creates text in parallel while supporting streaming responses, the use of various tools, structured outputs, and multimodal inputs, including text, images, and audio. By tapping into the Inception API, development teams can seamlessly implement the model across a range of applications, such as chatbots, voice-activated systems, search and browsing interfaces, educational tools, and other tasks that require responsive text generation. This robust model is accessible through the Inception API and its partnered inference providers, as well as being compatible with OpenAI's API, which facilitates smooth integration into pre-existing applications. Developers have the opportunity to evaluate the output quality and latency before integrating the model into their systems, thanks to the extensive documentation that accompanies the API and SDK ecosystem. The model operates on a token-based pricing structure, providing users with a free quota and additional paid options for both input and output tokens; enterprise-level solutions also include dedicated capacity and tailored support, making it adaptable for various projects. Additionally, Mercury 3 not only enhances development efficiency but also significantly improves user engagement and satisfaction, positioning developers to leverage sophisticated AI functionalities in their creations. In this way, it serves as a valuable resource for those aiming to stay at the forefront of technological innovation.

Media

Media

Integrations Supported

Baseten
OpenRouter
Fireworks AI
Groq
Hugging Face
Modal
Nebius
Together AI
vLLM

Integrations Supported

Baseten
OpenRouter
Amazon Bedrock
Microsoft Foundry
OpenAI
Vercel AI Gateway

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

$0.10/1M input tokens
Launch pricing is $0.10 per million input tokens and $0.35 per million output tokens, 50% below standard rates of $0.20 and $0.70. A free allocation of 100 million tokens is available. Usage is token-metered; enterprise deployments offer dedicated capacity and priority support.
Free Version

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Supported Platforms

SaaS

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

Inception

Date Founded

2024

Company Location

United States

Company Website

www.inceptionlabs.ai/models

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 Models

Not specified

AI Reasoning Models

Not specified

Large Language Models

Not specified

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