---
title: Chatterbox-Flash TTS
emoji: 🎙️
colorFrom: red
colorTo: indigo
sdk: gradio
sdk_version: 6.26.0
app_file: app.py
short_description: Block-diffusion zero-shot text-to-speech by Resemble AI
python_version: "3.12"
startup_duration_timeout: 30m
---

# Chatterbox-Flash TTS

[Chatterbox-Flash](https://github.com/resemble-ai/chatterbox-flash) is a prior-calibrated block-diffusion zero-shot text-to-speech model by Resemble AI. It extends Chatterbox-TTS with a parallel masked decoder that enables streaming generation with significantly lower latency.

## How it works

1. Enter the text you want to synthesize.
2. Optionally upload a short reference audio clip to clone a specific voice.
3. Click **Generate** to produce speech.

The model uses a block-diffusion decoder (based on Llama-520M) with prior-calibrated PMI scoring and early decoding via a time-shifted quantile schedule, paired with the original S3Gen flow-matching vocoder and GE2E voice encoder.

## Reference

- **Paper**: [Chatterbox-Flash: Prior-Calibrated Block Diffusion for Streaming Zero-Shot TTS](https://huggingface.co/papers/2605.30748)
- **Model**: [ResembleAI/chatterbox-flash](https://huggingface.co/ResembleAI/chatterbox-flash)
- **Code**: [github.com/resemble-ai/chatterbox-flash](https://github.com/resemble-ai/chatterbox-flash)
- **License**: MIT