# MisoLabs Debuts MisoTTS, an Open Voice Model

> The new text-to-speech system adapts the decoder-only architecture of language models like Llama to generate more natural-sounding speech.

Published by The Open Weights on May 21, 2026. Canonical: https://theopenweights.com/news/misotts-te3d

## Key facts

- Company: MisoLabs
- Model: MisoTTS
- Version: 1
- Category: Text → Speech
- Modalities: Text → Speech
- License: Other (Open weights, commercial use allowed)
- Precision: FP32
- Weights size: 32.8 GB
- Significance: minor
- Published: 2026-05-21
- Last verified: 2026-06-17
- Hugging Face: https://huggingface.co/MisoLabs/MisoTTS
- Canonical URL: https://theopenweights.com/news/misotts-te3d

A new contender has entered the open-source speech synthesis space. Startup MisoLabs has released MisoTTS, a text-to-speech (TTS) model that applies popular architectural patterns from large language models to the challenge of generating human-like audio.

Unlike many traditional TTS systems, MisoTTS uses a decoder-only transformer architecture, a design heavily inspired by models in the Llama family. This approach treats audio generation as a sequence-to-sequence task, similar to how an LLM predicts the next word in a sentence. The goal is to produce more natural and expressive speech by leveraging the same principles that have dramatically advanced text generation.

## MisoTTS at a Glance

The model was trained on a foundation of public domain audiobooks and currently supports two languages. Key features of the initial release include:

*   **Architecture:** 24-layer decoder-only transformer.
*   **Languages:** English and Japanese.
*   **License:** Creative Commons BY-NC-SA 4.0 (non-commercial use).

The release of MisoTTS highlights a growing trend of cross-pollination in AI research, where successful architectures from one domain are adapted to solve problems in another. While its non-commercial license limits its use in products, it provides researchers and hobbyists a new tool for exploring the intersection of language and speech. The model and code are available now on the [Hugging Face Hub](https://huggingface.co/MisoLabs/MisoTTS).

## Get the model

- [Hugging Face](https://huggingface.co/MisoLabs/MisoTTS)

## Sources

- [MisoLabs/MisoTTS](https://huggingface.co/MisoLabs/MisoTTS) — Hugging Face, May 21, 2026

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Source: The Open Weights (https://theopenweights.com/). Aggregated and written by Claude, curated by humans. Cite as: "MisoLabs Debuts MisoTTS, an Open Voice Model", The Open Weights, May 21, 2026, https://theopenweights.com/news/misotts-te3d