# Eleven v4 Turbo

> Generate natural, expressive speech with Eleven v4 Turbo. Supports 90+ languages, inline audio tags, stability and similarity controls, 19 output formats, and optional timing files through an asynchronous API.

## Overview

- Submit: `https://api.poyo.ai/api/generate/submit`
- Status: `https://api.poyo.ai/api/generate/status/{task_id}`
- Page: https://poyo.ai/models/eleven-v4-turbo
- Model page ID: `eleven-v4-turbo`
- API model ID: `elevenlabs-v4-turbo-tts`
- Category: Music
- Auth: `Authorization: Bearer $POYO_API_KEY`
- Create a key at https://poyo.ai/dashboard/api-key

This model uses PoYo's unified async API. POST the JSON body below, then poll status with the returned `task_id` or receive a webhook on `callback_url`. Failed tasks are not charged.

## Pricing

- Text to speech: 8 credits ($0.040) per 1000 characters

For more details, see https://poyo.ai/models/eleven-v4-turbo.

## API Information

The request envelope is always `{ model, input, callback_url? }`. Input fields below are nested under `input`.

### Request envelope

- `model` (`ModelEnum`, required):
  - Options: `"elevenlabs-v4-turbo-tts"`
- `callback_url` (`string`, optional):
  Optional completion or failure callback URL.

### Input Schema

The API accepts the following `input` parameters:

- `output_format` (`OutputFormatEnum`, optional):
  Audio codec, sample rate, and bitrate.
  - Default: `"mp3_44100_128"`
  - Options: `"mp3_22050_32"`, `"mp3_44100_32"`, `"mp3_44100_64"`, `"mp3_44100_96"`, `"mp3_44100_128"`, `"mp3_44100_192"`, `"pcm_8000"`, `"pcm_16000"`, `"pcm_22050"`, `"pcm_24000"`, `"pcm_44100"`, `"pcm_48000"`, `"ulaw_8000"`, `"alaw_8000"`, `"opus_48000_32"`, `"opus_48000_64"`, `"opus_48000_96"`, `"opus_48000_128"`, `"opus_48000_192"`
- `language_code` (`string`, optional):
  ISO 639-1 language code.
- `apply_text_normalization` (`ApplyTextNormalizationEnum`, optional):
  Normalize numbers and dates.
  - Default: `"auto"`
  - Options: `"auto"`, `"on"`, `"off"`
- `stability` (`float`, optional):
  Voice stability, from 0 to 1.
  - Default: `0.5`
  - Range: `0` to `1`
- `text` (`string`, required):
  Text.
  - Length: 1 to 5000 characters
- `voice` (`string`, optional):
  Prebuilt voice for single-speaker speech.
  - Default: `"Rachel"`
  - Length: 1 to unbounded characters
- `similarity_boost` (`float`, optional):
  Voice similarity, from 0 to 1.
  - Default: `0.75`
  - Range: `0` to `1`
- `timestamps` (`boolean`, optional):
  Return timing data as a separate JSON file when available.
  - Default: `false`

Required Parameters Example:

```json
{
  "model": "elevenlabs-v4-turbo-tts",
  "input": {
    "text": "Hello! Welcome to PoYo."
  }
}
```

Full Example:

```json
{
  "model": "elevenlabs-v4-turbo-tts",
  "input": {
    "text": "Hello! Welcome to PoYo.",
    "output_format": "mp3_44100_128",
    "apply_text_normalization": "auto",
    "stability": 0.5,
    "voice": "Rachel",
    "similarity_boost": 0.75
  }
}
```

example-2:

```json
{
  "model": "elevenlabs-v4-turbo-tts",
  "input": {
    "text": "Welcome to PoYo.",
    "timestamps": true,
    "output_format": "pcm_24000"
  }
}
```

### Output Schema

Submit returns a `task_id`. Poll `GET /api/generate/status/{task_id}` until `status` is `finished` or `failed`. Completed media is in `data.files`.

Response fields:

- `code` (`integer`, required):
  - Examples: `200`
- `data` (`object`, required):

Example Response:

```json
{
  "code": 200,
  "data": {
    "task_id": "task_example",
    "status": "finished",
    "files": [
      {
        "file_url": "https://storage.poyo.ai/models/eleven-v4-turbo/examples/eleven-v4-turbo-default-output-1-e64653d3e19e9395.mp3",
        "file_type": "audio"
      }
    ]
  }
}
```

## Usage Examples

### cURL

```bash
curl --request POST \
  --url https://api.poyo.ai/api/generate/submit \
  --header "Authorization: Bearer $POYO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{"model":"elevenlabs-v4-turbo-tts","input":{"text":"Hello! Welcome to PoYo."}}'
```

### Python

```python
import json
import os
import time
import requests

API = "https://api.poyo.ai"
headers = {
    "Authorization": f"Bearer {os.environ['POYO_API_KEY']}",
    "Content-Type": "application/json",
}
payload = json.loads("{\n  \"model\": \"elevenlabs-v4-turbo-tts\",\n  \"input\": {\n    \"text\": \"Hello! Welcome to PoYo.\"\n  }\n}")

submit = requests.post(f"{API}/api/generate/submit", headers=headers, json=payload)
submit.raise_for_status()
task_id = submit.json()["data"]["task_id"]

while True:
    status = requests.get(f"{API}/api/generate/status/{task_id}", headers=headers)
    status.raise_for_status()
    data = status.json()["data"]
    if data["status"] in ("finished", "failed"):
        print(data)
        break
    time.sleep(2)
```

### JavaScript

```javascript
const headers = {
  Authorization: `Bearer ${process.env.POYO_API_KEY}`,
  "Content-Type": "application/json",
};

const submit = await fetch("https://api.poyo.ai/api/generate/submit", {
  method: "POST",
  headers,
  body: JSON.stringify({
  "model": "elevenlabs-v4-turbo-tts",
  "input": {
    "text": "Hello! Welcome to PoYo."
  }
}),
});

const submitted = await submit.json();
const taskId = submitted.data.task_id;

while (true) {
  const statusResponse = await fetch(`https://api.poyo.ai/api/generate/status/${taskId}`, { headers });
  const status = await statusResponse.json();
  if (["finished", "failed"].includes(status.data.status)) {
    console.log(status.data);
    break;
  }
  await new Promise((resolve) => setTimeout(resolve, 2000));
}
```

## Additional Resources

### Documentation

- [Model Playground](https://poyo.ai/models/eleven-v4-turbo)
- [API Documentation](https://docs.poyo.ai/api-manual/music-series/elevenlabs-v4-turbo-tts)
- [API Documentation (Markdown)](https://docs.poyo.ai/api-manual/music-series/elevenlabs-v4-turbo-tts.md)
- [Task status](https://docs.poyo.ai/api-manual/task-management/query-task-status)
- [Webhooks](https://docs.poyo.ai/api-manual/task-management/webhooks)

### Other agent-readable surfaces

- [Platform overview](https://poyo.ai/llms.txt)
- [Documentation index](https://docs.poyo.ai/llms.txt)
- [Full documentation text](https://docs.poyo.ai/llms-full.txt)
- Any other model: `https://poyo.ai/models/<model-id>/llms.txt`