Join waitlist
Back to products
Zyphra Zonos

Zyphra Zonos

Highly expressive TTS model with high fidelity voice cloning

Website zyphra.com
Overview

What it is

Zonos offers flexible control of vocal speed, emotion, tone, and audio quality as well as instant unlimited high quality voice cloning. Zonos natively generates speech at 44Khz. Our hybrid is the first open-source SSM hybrid audio model.

Intent

I need it when

Access open-source TTS models for research, customization, or on-premise deployment

Zonos releases 1.6B transformer and hybrid models under Apache 2.0 license with weights on Hugging Face and sample inference code on GitHub, allowing researchers and developers to download, modify, and deploy models without vendor lock-in

Generate natural, expressive speech from text with voice cloning capabilities

Zonos provides high-fidelity voice cloning from 5-30 second audio clips and expressive text-to-speech generation with emotion conditioning (sadness, fear, anger, happiness, surprise), enabling users to create natural-sounding audio content with custom voices at competitive rates

Generate speech with fine-grained control over vocal characteristics

Zonos supports conditioning on speaking rate, pitch, audio quality, and specific emotions, plus accepts speaker embeddings or audio prefixes, giving users precise control over generated speech characteristics beyond basic text input

Scale speech generation without concurrent request limitations

Zonos API and playground offer unlimited concurrent generations with no throttling, enabling high-volume production workloads and batch processing without architectural constraints

Compare TTS quality against proprietary competitors before committing to a vendor

Zonos provides interactive audio samples comparing its output directly against ElevenLabs, Cartesia, and FishSpeech across diverse prompts, allowing buyers to evaluate quality objectively before purchase

Drop

Not a fit when

  • User requires support for languages beyond English, Chinese, Japanese, French, Spanish, and German, as model performance on other languages is not robust
  • User needs production-grade reliability without audio artifacts, as model exhibits coughing, clicking, laughing, squeaks, and heavy breathing especially at generation boundaries
  • User requires guaranteed text alignment and word-perfect output, as model can skip or repeat words in out-of-distribution sentences
  • User needs sub-200ms latency on consumer hardware, as real-time performance requires RTX 4090-class GPUs
  • User requires commercial closed-source licensing, as Zonos is released under permissive Apache 2.0 open-source license
Commercials

Pricing

Pay-per-use flat rate ($0.02/minute) or monthly subscription tiers with free minutes included View pricing