# ElevenLabs Eleven v4 Turbo

> ElevenLabs Eleven v4 Turbo text-to-speech via Fal.AI. The Turbo tier of Eleven v4 at half the rate, with the same audio tags, IPA pronunciation, voice controls and optional character-level timestamps. $0.04 per 1,000 characters.

- **Provider**: fal
- **Model ID**: elevenlabs/tts/eleven-v4-turbo
- **Category**: tts_voice
- **Credits**: 93 per request
- **Pricing Type**: token_based

## API Endpoint

Base URL: https://api.core.today/v1

### Create Prediction
POST /predictions

### Get Status
GET /predictions/{job_id}

### Cancel
DELETE /predictions/{job_id}

## Authentication

Header: `X-API-Key: YOUR_API_KEY`

## Input Parameters

- `voice` (string, optional): The voice to use for speech generation — an ElevenLabs premade voice name (e.g. Rachel, Aria, Roger, Sarah, George) or voice ID. (Default: `Rachel`)
- `language_code` (string, optional): Language code (ISO 639-1, e.g. en, ko, ja) for speech generation and text normalization. Auto-detected when omitted.
- `apply_text_normalization` (string, optional): Whether to normalize text such as numbers and dates before generation. (Default: `auto`; Options: `auto`, `on`, `off`)
- `output_format` (string, optional): Output format of the generated audio, formatted as codec_sample_rate_bitrate. (Default: `mp3_44100_128`; Options: `mp3_22050_32`, `mp3_44100_32`, `mp3_44100_64`, `mp3_44100_96`, `mp3_44100_128`, `mp3_44100_192`)
- `seed` (integer, optional): Seed for best-effort reproducibility. Identical output is not guaranteed. (Range: min: 0, max: 4294967295)
- `similarity_boost` (number, optional): How closely the output follows the reference voice. Higher values increase similarity but may reduce naturalness. (Default: `0.75`; Range: min: 0, max: 1)
- `timestamps` (boolean, optional): Whether to return character-level timing information with the generated audio. (Default: `False`)
- `text` (string, **required**): The text to convert to speech (billed per character). Supports audio tags such as [whispering] or [excited] and IPA pronunciation enclosed in forward slashes.
- `stability` (number, optional): Voice stability. Lower values allow more expressive delivery; higher values make delivery more consistent. (Default: `0.5`; Range: min: 0, max: 1)

## Example Request

```json
{
  "model": "elevenlabs/tts/eleven-v4-turbo",
  "input": {
    "voice": "Aria",
    "text": "[excited] Hello! Welcome to Eleven v4."
  }
}
```

## Response Format

```json
{
  "job_id": "abc123",
  "status": "pending",
  "provider": "replicate",
  "model": "black-forest-labs/flux-schnell",
  "created_at": "2026-01-01T00:00:00Z",
  "result": null,
  "error": null
}
```

Status values: `pending`, `processing`, `completed`, `failed`, `cancelled`

## Usage Flow

1. POST /predictions with model and input → receive job_id
2. Poll GET /predictions/{job_id} until status is `completed` or `failed`
3. Result contains output URL(s) or data

## Output Type

json

## Tags

text-to-speech, tts, audio, voice-synthesis, elevenlabs, turbo, multilingual

## Documentation

https://fal.ai/models/elevenlabs/tts/eleven-v4-turbo


## Token Pricing

- Input: 0.093 credits/token
- Output: 0.093 credits/token