Grok Text to Speech - Unifically

Generate speech audio from text using xAI’s Grok text-to-speech model. Choose a preset voice, a language (or automatic detection), a speaking speed, and an output format.

Model

xai/grok-tts

Pricing

Unit	Price
Per 1,000,000 characters	$7.50

Billing counts the characters of text as submitted. A 2,000-character request costs $0.015.

Parameters

Parameter	Type	Required	Default	Description
`text`	string	Yes	—	Text to convert to speech. Up to 60,000 characters per request
`voice_id`	string	No	`"ara"`	Preset voice ID (see Voices)
`language`	string	No	`"auto"`	BCP-47 language code (for example `en`, `es`, `pt-BR`), or `"auto"` to detect from the text
`speed`	number	No	`1.0`	Speech speed multiplier, `0.7`–`1.5`. `1.0` is normal
`format`	string	No	`"mp3"`	Audio format: `"mp3"`, `"wav"`, or `"pcm"`

Voices

voice_id takes a Grok preset voice ID; the default is ara. The full text-to-speech voice catalog is available on request at contact@unifically.com.

Example Request

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "xai/grok-tts",
    "input": {
      "text": "Welcome back. Your order has shipped and should arrive on Thursday.",
      "voice_id": "ara",
      "language": "en",
      "speed": 1.0,
      "format": "mp3"
    }
  }'

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

Completed Response

Poll GET /v1/tasks/{task_id} until status is completed:

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "completed",
    "output": {
      "url": "https://files.unifically.com/audio/tts_abc123def456.mp3",
      "characters": 68
    }
  }
}

url — the generated audio file in the requested format.
characters — the number of characters billed for the request.

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.