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What is Phonon?

Phonon is an open-weight text-to-speech (TTS) model and inference runtime that caters to developers who wish to integrate speech generation into applications with local and offline audio functionalities. This cutting-edge system converts written text into spoken words and can stream speech in real-time as it is generated. It provides interfaces for programming languages such as Rust and Python, includes a Swift package for iOS and macOS, offers JavaScript support for web browsers, and has libraries available for Android; it can also operate as a self-hosted server compatible with OpenAI's API. The model is designed to support various languages, including English, French, German, Spanish, and Portuguese, depending on the specific variant employed. Phonon is ideal for developers looking to embed speech capabilities into mobile, desktop, web, embedded, and server applications, particularly in situations that prioritize offline use or require enhanced privacy. The English model is comprised of 31 million parameters and is licensed under Apache 2.0, while the language-specific and multilingual models, with 40 million parameters, are available under CC BY-NC 4.0. Furthermore, the runtime's source code is offered under either the Apache 2.0 or MIT licenses, ensuring it is accessible for diverse development requirements. This adaptability and extensive support position Phonon as a highly versatile option for speech synthesis across a variety of platforms, making it a valuable asset for developers in the field.

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.

Media

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Media

Integrations Supported

Hugging Face

Integrations Supported

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

API Availability

Has API

API Availability

Pricing Information

Pricing not provided
Free Version

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

Supported Platforms

Android
iPhone
iPad
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

Gradium

Date Founded

2025

Company Location

France, United States

Company Website

gradium.ai/phonon

Company Facts

Organization Name

Meta

Date Founded

2004

Company Location

United States

Company Website

research.meta.ai/blog/muse-spark-open

Categories and Features

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

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