Zyphra Releases ZONOS2, an Open-Weight Real-Time Voice-Cloning Model

Zyphra released ZONOS2, an open-weight real-time voice-cloning model under the Apache 2.0 license, including model weights on Hugging Face and inference code on GitHub. The company also introduced ZTTS1 Eval, a new benchmark for measuring text-to-speech quality across clean and in-the-wild audio.

Zyphra @ZyphraAI released ZONOS2, an Apache 2.0 real time text to speech model for high fidelity voice cloning, the company said Friday in a thread on X and a launch blog post. The release is broader than a hosted API update. Zyphra is publishing model weights on Hugging Face, inference code on GitHub, and evaluation code for ZTTS1 Eval, a new benchmark the company says is designed to measure TTS quality across both clean and in the wild audio. In practical terms, Zyphra is trying to make t...