Resemble AIFastHigh

Chatterbox

Resemble AI's production-grade open-source TTS with unique emotion exaggeration control and instant voice cloning from a short reference audio. MIT-licensed and benchmarked against leading closed-source systems.

59 credits

per 1000 characters (0.057 credits/char, billed per character)

Unique emotion exaggeration control

Instant voice cloning from short audio

Production-grade open-source quality

CFG/pace control for delivery speed

Very low per-character price

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

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llms.txtllms.txt ↗

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "resemble-ai/chatterbox",
  "input": {
    "prompt": "We're excited to introduce Chatterbox, our first production-grade open source TTS model!",
    "exaggeration": 0.8,
    "cfg_weight": 0.5
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`prompt`	string	Yes	-	Text to synthesize
`audio_prompt`	string	No	-	Reference audio file for voice cloning (optional)
`exaggeration`	number	No	0.5	Emotion exaggeration (0.25-2.0). Neutral = 0.5; extreme values may be unstable
`cfg_weight`	number	No	0.5	CFG/pace weight (0.2-1.0)
`temperature`	number	No	0.8	Controls randomness (0.05-5.0)
`seed`	integer	No	0	Seed (0 for random)

How to Provide File Input

There are 3 ways to provide files for the audio_prompt parameter:

Recommended

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step needed.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=resemble-ai/chatterbox" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:audio_prompt=@your_file.png"

Image URL

Pass a publicly accessible URL directly. You can also use file_url from the Storage API.

{
  "model": "resemble-ai/chatterbox",
  "input": {
    "prompt": "your prompt here",
    "audio_prompt": "https://example.com/image.jpg"
  }
}

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Emotive Announcement

Expressive delivery with raised exaggeration

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "resemble-ai/chatterbox",
  "input": {
    "prompt": "We're excited to introduce Chatterbox, our first production-grade open source TTS model!",
    "exaggeration": 0.8,
    "cfg_weight": 0.5
  }
}'