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Kyutai TTS

Kyutai TTS

Kyutai TTS is a state-of-the-art text-to-speech system optimized for real-time usage, supporting English and French with ultra-low latency and advanced voice cloning capabilities.

Kyutai TTS is text-to-speech software teams evaluate for text-to-voice. Use this page to review pricing, integration signals, and the best alternatives before you commit.

Free API 70/100
#15 in Text-to-Voice (15 tools)
Added 0 year ago
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Quick Overview

Best for: Text-to-Voice

What it does

Text-to-Speech software for decision-makers comparing workflow fit and alternatives.

Best fit

Text-to-Voice

Pricing snapshot

Free

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Kyutai TTS

Kyutai TTS is a text-to-speech model designed for real-time applications, originally developed as an internal tool for Moshi and now publicly released as the kyutai/tts-1.6b-en_fr model with 1.6 billion parameters. It features innovations that enable streaming text input, allowing the model to start generating audio with only partial text input, resulting in ultra-low latency. The system supports English and French and is capable of long-form audio generation without degradation in quality. It also includes voice cloning capabilities using a 10-second audio sample to match voice characteristics, intonation, and recording quality. Kyutai TTS is production-ready with a robust Rust server supporting streaming over websockets and can handle multiple simultaneous connections efficiently.

Kyutai TTS is an open-source text-to-speech model optimized for real-time use, capable of streaming text input while streaming audio output to enable ultra-low latency for LLM applications.

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Key Features

Real-time streaming text input

Kyutai TTS can start generating audio as soon as it receives the first few text tokens, enabling ultra-low latency streaming without needing the full text in advance.

Low latency

The model achieves a latency of 220ms from receiving the first text token to producing audio, with 350ms latency observed in batch serving on L40S GPU.

Voice cloning

Supports voice cloning from a 10-second audio sample, replicating voice, intonation, mannerisms, and recording quality.

Long-form audio generation

Capable of generating long audio sequences without quality degradation, unlike many transformer-based TTS models.

Word-level timestamps

Outputs exact timestamps for each word generated, useful for real-time subtitles and handling interruptions.

Production-ready server

Includes a Rust server with websocket streaming, Docker support, and can serve multiple simultaneous connections efficiently.

Multilingual support

Currently supports English and French, with plans to explore additional languages.

Delayed streams modeling

Innovative modeling technique enabling streaming in text and audio simultaneously, allowing alignment and low latency.

Pricing

Free Tier Available

Kyutai TTS is publicly available as an open model on Hugging Face, with free access to the model and demo via Unmute.

Use Cases

Real-time voice synthesis

Ideal for applications requiring immediate audio feedback from partial text input, such as live assistants or interactive voice systems.

Voice cloning for personalized TTS

Enables creation of personalized voices for accessibility tools, entertainment, or custom voice assistants using short audio samples.

Long-form audio content generation

Suitable for generating audiobooks, podcasts, or extended narrations without quality loss over time.

Real-time subtitles and transcription alignment

Word-level timestamps allow synchronization of audio with subtitles and handling user interruptions gracefully.

Integrations

Unmute

An interactive real-time demo platform that uses Kyutai TTS for streaming text-to-speech.

Hugging Face

Model hosting and repository for Kyutai TTS and voice samples.

Rust server with Websockets

Enables integration into applications requiring streaming TTS over network connections.

Benefits

Ultra-low latency streaming text-to-speech enabling real-time applications.
High fidelity voice cloning matching voice characteristics and recording quality.
Robust production-ready server infrastructure with scalable concurrency.
Supports long-form audio generation without degradation.
Outputs precise word-level timestamps for enhanced subtitle and interaction support.

Limitations

Currently supports only English and French languages.
Voice embedding model for cloning is not publicly released to protect privacy.
No explicit pricing or commercial licensing details provided.

Frequently Asked Questions

What languages does Kyutai TTS support?
Kyutai TTS currently supports English and French, with plans to add more languages in the future.
How does Kyutai TTS achieve low latency?
It uses delayed streams modeling to stream text input and audio output simultaneously, allowing audio generation to start with partial text input.
Can I clone a custom voice with Kyutai TTS?
Yes, by providing a 10-second audio sample, Kyutai TTS can clone the voice, intonation, and recording quality. However, the voice embedding model is not publicly released to ensure consent.
Is Kyutai TTS suitable for long audio generation?
Yes, it supports long-form audio generation without quality degradation, unlike many other transformer-based TTS models.
How can I deploy Kyutai TTS in my application?
Kyutai TTS includes a Rust server with websocket streaming and a Dockerfile for easy deployment in production environments.

Getting Started

  1. 1 Access the Kyutai TTS model at https://huggingface.co/kyutai/tts-1.6b-en_fr.
  2. 2 Try the interactive real-time demo via Unmute at https://unmute.sh/.
  3. 3 Deploy the Rust server using the provided Dockerfile for production use.
  4. 4 Use a 10-second audio sample to specify voice cloning if desired.
  5. 5 Stream text input incrementally to leverage ultra-low latency capabilities.

Support

Documentation

Available on the Kyutai website and Hugging Face model pages.

Community

Users can engage via Kyutai's website and related project repositories.

API

Available: Yes
Documentation:

Documentation available on Kyutai website and Hugging Face pages; includes Rust server with websocket streaming API.

Rate Limits:

Batching supports up to 32 simultaneous requests with observed latency of 350ms on L40S GPU.

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