Chatterbox HD (Resemble AI)
Resemble AI's high-definition text-to-speech model, delivering highly expressive, natural voice synthesis with zero-shot cloning.
Overview
What is Chatterbox HD (Resemble AI)
Chatterbox HD is a high-definition text-to-speech model developed by Resemble AI. Released as part of the Chatterbox family, it delivers exceptionally expressive, natural-sounding voice synthesis and zero-shot voice cloning from just seconds of reference audio, optimized for realistic human-like speech.
Running it privately on Venice
On Venice, you can access Chatterbox HD with absolute privacy. Venice routes your text-to-speech requests with zero retention, ensuring your synthesized scripts and voice outputs are never stored, profiled, or used to train external models. Experience sovereign, high-fidelity audio generation without Big Tech surveillance.
Assessment
Strengths and limitations
- High-definition, studio-quality audio output with realistic human-like intonation.
- Zero-shot voice cloning capable of replicating a voice from just a few seconds of reference audio.
- Unique emotion control, allowing users to adjust speech intensity from monotone to highly expressive.
- Native support for paralinguistic tags (such as [cough], [laugh], [chuckle]) to add lifelike realism.
- Built-in PerTh watermarking to ensure secure, verifiable synthetic audio generation.
- Strict character limit of 2,000 characters per individual request.
- Does not support standard SSML tags like break, whisper, or emphasis.
- This high-definition variant is proprietary and closed-weights, unlike the base open-source Chatterbox models.
Samples
Sample outputs
Generated on Venice with our standard prompt suite — the same scripts we run through every model of this type, so you can judge it like-for-like.
“On Venice, your prompts are processed privately and never stored, profiled, or used to train anyone's model.”
“Wait — so I can run a private voice model with zero data retention, and pay only for what I use? That's genuinely useful.”
“Three… two… one… liftoff! The rocket roared into the night sky as the crowd erupted in cheers.”
Specifications
Datasheet
- Maker
- Resemble AI
- Released
- April 2025
- Modality
- Text-to-speech (TTS)
- Latency
- ~200ms - 250ms
- Max character limit
- 2,000 characters
- Open weights
- No (for HD variant)
- Privacy on Venice
- Private — zero retention
- Available on Venice since
- Apr 2026
API
Call it from your code
Venice exposes an OpenAI-compatible API. Point your base URL at Venice and pass the model id.
curl https://api.venice.ai/api/v1/audio/speech \
-H "Authorization: Bearer $VENICE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "tts-chatterbox-hd",
"input": "On Venice, your prompts are processed privately.",
"voice": "af_sky",
"response_format": "mp3"
}' --output speech.mp3Pricing
What it costs on Venice
Billed per character on Venice: $50 per 1M characters of synthesized speech.
New Venice accounts include a free daily allowance and 500 welcome credits — no credit card required.
Alternatives
How it compares
| Model | Best for | Price (per 1M chars) | Latency | Open weights | Key Strength |
|---|---|---|---|---|---|
| Chatterbox HD | A premium balance of high-fidelity voice cloning and emotional nuance. | $50 / 1M chars | ~200-250ms | No | Expressive emotion & cloning |
| ElevenLabs Turbo v2.5 | Highly realistic but slightly more expensive than Chatterbox HD. | $62.50 / 1M chars | ~150-200ms | No | Industry-leading realism |
| Kokoro Text to Speech | Incredibly cheap and open-source, but lacks advanced emotion controls. | $3.50 / 1M chars | ~100ms | Yes | Ultra-low cost & open-source |
| Gemini 3.1 Flash TTS | Very expensive option suited for enterprise workflows. | $187.50 / 1M chars | ~200ms | No | Google ecosystem integration |
A premium balance of high-fidelity voice cloning and emotional nuance.
Use cases
What it is good for
- 01Creating highly realistic voiceovers for video content, podcasts, and audiobooks.
- 02Developing low-latency conversational voice agents and interactive virtual assistants.
- 03Zero-shot voice cloning for localized content translation while preserving the speaker's original voice.
- 04Generating expressive, emotionally nuanced narration for gaming and creative storytelling.
- 05Producing secure, watermarked synthetic speech for corporate and enterprise applications.
Prompting
Getting better results
Keep your text inputs under the 2,000-character limit to avoid truncation.
Insert native paralinguistic tags like [laugh] or [gasp] directly into the text for natural pauses and human-like emotion.
Use descriptive punctuation (like dashes and ellipses) to guide the model's natural pacing and cadence.
Version history
The original high-quality TTS model with emotion control.
Ultra-fast 350M parameter model with native paralinguistic tags.
Current — High-definition variant delivering enhanced audio fidelity.
FAQ
Frequently asked questions
Chatterbox HD is a premium, high-definition text-to-speech model developed by Resemble AI. It is designed to generate highly realistic, emotionally expressive human speech and supports zero-shot voice cloning from short audio samples.
Chatterbox HD is priced at $50 per 1 million characters of synthesized speech on Venice. You are billed dynamically based on the exact character count of your text inputs.
While Resemble AI's base Chatterbox family has open-source roots under the MIT license, the high-definition Chatterbox HD variant hosted here is a proprietary, closed-weights model. You can try it on Venice using your daily free credits or paid balance.
Yes, Chatterbox HD supports zero-shot voice cloning. It can replicate a target voice with high accuracy using just a few seconds of reference audio, making it highly efficient for custom voice generation.
Chatterbox HD is more cost-effective at $50 per 1M characters compared to ElevenLabs Turbo v2.5 at $62.50. While ElevenLabs is often considered the gold standard for raw realism, Chatterbox HD offers superior built-in emotion controls and competitive blind-test performance.
Paralinguistic tags are native markers like [cough], [laugh], or [chuckle] that you can insert directly into your text. Chatterbox HD processes these tags to generate realistic non-speech sounds, enhancing the lifelike quality of the audio.
Yes. Venice operates under a strict private, zero-retention policy. Your text prompts and generated audio files are processed securely and are never stored, logged, or used to train AI models.
Chatterbox HD has a maximum limit of 2,000 characters per text-to-speech generation request.
Run Chatterbox HD (Resemble AI) privately
No prompt logging. No data used for training.