---
title: Eleven Turbo v2 | Runware Docs
url: https://runware.ai/docs/models/elevenlabs-turbo-v2
description: Fast English text to speech for real time apps
---
# Eleven Turbo v2

Eleven Turbo v2 is an English text to speech model tuned for low latency and low cost. It generates smooth natural speech for chatbots, IVR flows, and automated announcements. Ideal for production systems that need rapid responses and predictable pricing.

- **ID**: `elevenlabs:23@1`
- **Status**: live
- **Creator**: ElevenLabs
- **Capabilities**: Text to Audio

## Request Parameters

**API Options**

Platform-level options for task execution and delivery.

### [taskType](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `audioInference`

Identifier for the type of task being performed

### [taskUUID](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task.

### [outputType](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-outputtype)

- **Type**: `string`
- **Default**: `URL`

Audio output type.

**Allowed values**: `URL` `base64Data` `dataURI`

### [outputFormat](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-outputformat)

- **Type**: `string`
- **Default**: `MP3`

Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities.

- \`MP3\`: Compressed audio, smaller file size.
- \`WAV\`: Uncompressed, high-quality audio.
- \`FLAC\`: Lossless compression.
- \`OGG\`: Open-source compressed audio format (Vorbis codec).

**Allowed values**: `MP3` `WAV` `FLAC` `OGG`

### [audioSettings](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-audiosettings)

- **Path**: `audioSettings.bitrate`
- **Type**: `object (3 properties)`

Audio encoding settings for controlling the bitrate, number of channels, and sample rate of the generated audio. Only applicable for lossy output formats (`MP3` and `OGG`). When using lossless formats (`WAV` or `FLAC`), this parameter must not be provided.

The available sample rates and valid bitrate ranges depend on the output format. For `OGG`, bitrate limits also vary by the number of channels.

**MP3 bitrate limits**:

Bitrate limits for MP3 are the same regardless of mono or stereo.

| Sample Rate | Min Bitrate | Max Bitrate |
| --- | --- | --- |
| 8,000 Hz | 8 kbps | 64 kbps |
| 11,025 Hz | 8 kbps | 64 kbps |
| 12,000 Hz | 8 kbps | 64 kbps |
| 16,000 Hz | 8 kbps | 160 kbps |
| 22,050 Hz | 8 kbps | 160 kbps |
| 24,000 Hz | 8 kbps | 160 kbps |
| 32,000 Hz | 32 kbps | 320 kbps |
| 44,100 Hz | 32 kbps | 320 kbps |
| 48,000 Hz | 32 kbps | 320 kbps |

**OGG bitrate limits — Mono (1 channel)**:

| Sample Rate | Min Bitrate | Max Bitrate |
| --- | --- | --- |
| 8,000 Hz | 8 kbps | 40 kbps |
| 12,000 Hz | 16 kbps | 48 kbps |
| 16,000 Hz | 16 kbps | 96 kbps |
| 24,000 Hz | 16 kbps | 80 kbps |
| 48,000 Hz | 32 kbps | 224 kbps |

**OGG bitrate limits — Stereo (2 channels)**:

| Sample Rate | Min Bitrate | Max Bitrate |
| --- | --- | --- |
| 8,000 Hz | 16 kbps | 80 kbps |
| 12,000 Hz | 16 kbps | 96 kbps |
| 16,000 Hz | 24 kbps | 192 kbps |
| 24,000 Hz | 32 kbps | 160 kbps |
| 48,000 Hz | 48 kbps | 256 kbps |

> [!NOTE]
> **Lossless formats**: When `outputFormat` is set to `WAV` or `FLAC`, the `audioSettings` parameter is not available since these formats produce uncompressed or lossless audio with no configurable encoding settings.

#### [bitrate](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-audiosettings-bitrate)

- **Path**: `audioSettings.bitrate`
- **Type**: `integer`
- **Min**: `8`

Audio bitrate in kbps.

#### [channels](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-audiosettings-channels)

- **Path**: `audioSettings.channels`
- **Type**: `integer`
- **Default**: `2`

Number of audio channels. 1 for mono, 2 for stereo.

**Allowed values**: `1` `2`

#### [sampleRate](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-audiosettings-samplerate)

- **Path**: `audioSettings.sampleRate`
- **Type**: `integer`

Audio sample rate in Hz.

### [webhookURL](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-webhookurl)

- **Type**: `string`
- **Format**: `URI`

Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available.

**Learn more** (1 resource):

- [Webhooks](https://runware.ai/docs/platform/webhooks) (platform)

### [deliveryMethod](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-deliverymethod)

- **Type**: `string`
- **Default**: `sync`

Determines how the API delivers task results.

**Allowed values**:

- `sync` Returns complete results directly in the API response.
- `async` Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.

**Learn more** (1 resource):

- [Task Polling](https://runware.ai/docs/platform/task-polling) (platform)

### [uploadEndpoint](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-uploadendpoint)

- **Type**: `string`
- **Format**: `URI`

Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials.

**Common use cases:**

- **Cloud storage**: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs.
- **CDN integration**: Upload to content delivery networks for immediate distribution.

```text
// S3 presigned URL for secure upload
https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600

// Google Cloud Storage presigned URL
https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789

// Custom storage endpoint
https://storage.example.com/uploads/generated-image.jpg
```

The content data will be sent as the request body to the specified URL when generation is complete.

### [ttl](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-ttl)

- **Type**: `integer`
- **Min**: `60`

Time-to-live (TTL) in seconds for generated content. Only applies when `outputType` is `URL`.

### [includeCost](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-includecost)

- **Type**: `boolean`
- **Default**: `false`

Include task cost in the response.

### [numberResults](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-numberresults)

- **Type**: `integer`
- **Min**: `1`
- **Max**: `4`
- **Default**: `1`

Number of results to generate. Each result uses a different seed, producing variations of the same parameters.

**Generation Parameters**

Core parameters for controlling the generated content.

### [model](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-model)

- **Type**: `string`
- **Required**: true
- **Value**: `elevenlabs:23@1`

Identifier of the model to use for generation.

**Learn more** (3 resources):

- [Text To Image: Model Selection The Foundation Of Generation](https://runware.ai/docs/guides/text-to-image#model-selection-the-foundation-of-generation) (guide)
- [Image Inpainting: Model Specialized Inpainting Models](https://runware.ai/docs/guides/image-inpainting#model-specialized-inpainting-models) (guide)
- [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/guides/image-outpainting#other-critical-parameters) (guide)

### [seed](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-seed)

- **Type**: `integer`
- **Min**: `0`
- **Max**: `4294967295`

Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range.

### [speech](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-speech)

- **Path**: `speech.text`
- **Type**: `object (2 properties)`
- **Required**: true

Settings for speech generation.

#### [text](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-speech-text)

- **Path**: `speech.text`
- **Type**: `string`
- **Max**: `30000`

Text to convert to speech.

#### [language](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-speech-language)

- **Path**: `speech.language`
- **Type**: `string`
- **Min**: `1`

Language code for speech generation.

**Allowed values**: `en`

**Provider Settings**

Parameters specific to this model provider. These must be nested inside the \`providerSettings.elevenlabs\` object.

### [textToSpeech](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech)

- **Path**: `providerSettings.elevenlabs.textToSpeech`
- **Type**: `object (9 properties)`

Provider-specific settings for ElevenLabs text-to-speech generation.

#### [voiceSettings](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-voicesettings)

- **Path**: `providerSettings.elevenlabs.textToSpeech.voiceSettings`
- **Type**: `object (4 properties)`

Voice settings overriding stored settings for the given voice. Applied only on the given request.

##### [stability](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-voicesettings-stability)

- **Path**: `providerSettings.elevenlabs.textToSpeech.voiceSettings.stability`
- **Type**: `float`
- **Min**: `0`
- **Max**: `1`

Controls voice stability and randomness between each generation. Lower values introduce broader emotional range, higher values produce a more consistent tone.

##### [useSpeakerBoost](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-voicesettings-usespeakerboost)

- **Path**: `providerSettings.elevenlabs.textToSpeech.voiceSettings.useSpeakerBoost`
- **Type**: `boolean`

Boosts similarity to the original speaker at a slight increase in computational load and latency.

##### [similarityBoost](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-voicesettings-similarityboost)

- **Path**: `providerSettings.elevenlabs.textToSpeech.voiceSettings.similarityBoost`
- **Type**: `float`
- **Min**: `0`
- **Max**: `1`

Controls how closely the AI adheres to the original voice when attempting to replicate it.

##### [style](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-voicesettings-style)

- **Path**: `providerSettings.elevenlabs.textToSpeech.voiceSettings.style`
- **Type**: `float`
- **Min**: `0`
- **Max**: `1`

Controls style exaggeration of the voice. Higher values amplify the style of the original speaker but may increase latency.

#### [previousText](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-previoustext)

- **Path**: `providerSettings.elevenlabs.textToSpeech.previousText`
- **Type**: `string`
- **Max**: `1000`

Text that came before the current request. Improves speech continuity when concatenating multiple generations.

#### [nextText](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-nexttext)

- **Path**: `providerSettings.elevenlabs.textToSpeech.nextText`
- **Type**: `string`
- **Max**: `1000`

Text that comes after the current request. Improves speech continuity when concatenating multiple generations.

#### [applyTextNormalization](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-applytextnormalization)

- **Path**: `providerSettings.elevenlabs.textToSpeech.applyTextNormalization`
- **Type**: `string`
- **Default**: `auto`

Controls text normalization behavior (e.g., spelling out numbers).

**Allowed values**:

- `auto` Automatically decides whether to apply text normalization.
- `on` Always applies text normalization.
- `off` Skips text normalization entirely.

#### [applyLanguageTextNormalization](https://runware.ai/docs/models/elevenlabs-turbo-v2#request-providersettings-elevenlabs-texttospeech-applylanguagetextnormalization)

- **Path**: `providerSettings.elevenlabs.textToSpeech.applyLanguageTextNormalization`
- **Type**: `boolean`
- **Default**: `false`

Enables language-specific text normalization for proper pronunciation. Currently only supported for Japanese. Warning: can significantly increase latency.

## Response Parameters

### [taskType](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-tasktype)

- **Type**: `string`
- **Required**: true
- **Value**: `audioInference`

Type of the task.

### [taskUUID](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-taskuuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the task.

### [audioUUID](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-audiouuid)

- **Type**: `string`
- **Required**: true
- **Format**: `UUID v4`

UUID of the output audio.

### [audioURL](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-audiourl)

- **Type**: `string`
- **Format**: `URI`

URL of the output audio.

### [audioBase64Data](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-audiobase64data)

- **Type**: `string`

Base64-encoded audio data.

### [audioDataURI](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-audiodatauri)

- **Type**: `string`
- **Format**: `URI`

Data URI of the output audio.

### [seed](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-seed)

- **Type**: `integer`

The seed used for generation. If none was provided, shows the randomly generated seed.

### [cost](https://runware.ai/docs/models/elevenlabs-turbo-v2#response-cost)

- **Type**: `float`

Task cost in USD. Present when `includeCost` is set to `true` in the request.

## Examples

### Harbor Tram Service Bulletin (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-turbo-v2/f34b0c78-b52c-4f97-88aa-7c5a6fc3304a.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "2dde94ac-2a58-4723-b1b4-eb6f8cc4d132",
  "model": "elevenlabs:23@1",
  "seed": 34553,
  "speech": {
    "text": "Attention passengers at Pier Seven. Due to strong crosswinds along the eastern causeway, the Blue Line harbor tram is operating on a reduced schedule this evening. Departures toward Bayside Terminal will leave at 6:10, 6:25, and 6:40 p.m. only. Customers traveling to Alder Point should transfer at Maritime Square for shuttle coaches. Please allow an additional fifteen minutes for your journey. Staff are available near the ticket gates for accessibility assistance and route guidance. Thank you for your patience, and please stand behind the yellow safety line until the tram comes to a complete stop.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.72,
          "similarityBoost": 0.78,
          "style": 0.18,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "on"
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "2dde94ac-2a58-4723-b1b4-eb6f8cc4d132",
  "audioUUID": "74f1875f-a810-4b74-b748-0f63959e0c1a",
  "audioURL": "https://am.runware.ai/audio/os/a03d21/ws/5/ai/74f1875f-a810-4b74-b748-0f63959e0c1a.mp3",
  "seed": 34553,
  "cost": 0.09306
}
```

---

### Subterranean Evacuation Platform Announcement (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-turbo-v2/cbf25a50-0fdf-484a-a52c-71468e2d7cbf.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "39e50257-c694-40a9-b897-c29f3f82b5d7",
  "model": "elevenlabs:23@1",
  "seed": 65700,
  "speech": {
    "text": "Attention passengers on Platform Cinder. Service to the lower tunnel has been suspended due to geothermal pressure fluctuations near Vent Shaft Nine. Please remain behind the yellow boundary and follow the illuminated arrows to the alternate departure point at Platform Ember. Priority boarding is now open for travelers with children, mobility needs, or heavy equipment. Maintenance crews are on site, and the next status update will be issued in four minutes. Again, this is a temporary service suspension for the lower tunnel line at Platform Cinder.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.78,
          "similarityBoost": 0.72,
          "style": 0.2,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "auto"
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "39e50257-c694-40a9-b897-c29f3f82b5d7",
  "audioUUID": "a031e120-6ee6-4d3a-bcf2-e30967ddd569",
  "audioURL": "https://am.runware.ai/audio/os/a08d21/ws/5/ai/a031e120-6ee6-4d3a-bcf2-e30967ddd569.mp3",
  "seed": 65700,
  "cost": 0.08242
}
```

---

### Lighthouse Fog Warning Broadcast (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-turbo-v2/d90a3c4c-599d-425a-b136-cf2fe28cbd49.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "ecfce84a-6ade-4e62-981b-9838617cf2d7",
  "model": "elevenlabs:23@1",
  "seed": 78476,
  "speech": {
    "text": "Attention all vessels approaching Grayhaven Inlet. Dense fog has reduced visibility across the eastern channel to less than two hundred meters. Sound one prolonged blast every two minutes while underway, reduce speed immediately, and maintain radio watch on channel sixteen. The north pier beacon is operating normally. Tug assistance is available for inbound cargo traffic and emergency medical transport only. Small craft are advised to hold position outside the breakwater until further notice. This advisory remains in effect until zero six thirty local time.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.72,
          "similarityBoost": 0.78,
          "style": 0.2,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "on"
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "ecfce84a-6ade-4e62-981b-9838617cf2d7",
  "audioUUID": "be362384-a8ff-4e76-8597-301de07c3d45",
  "audioURL": "https://am.runware.ai/audio/os/a01d21/ws/5/ai/be362384-a8ff-4e76-8597-301de07c3d45.mp3",
  "seed": 78476,
  "cost": 0.08993
}
```

---

### Orbital Ferry Delay Bulletin (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-turbo-v2/39e54136-ed81-4635-9b16-a7327dc3d338.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "99441597-92ad-4ee9-8b18-673b406b933c",
  "model": "elevenlabs:23@1",
  "seed": 32436,
  "speech": {
    "text": "Attention passengers on Platform C. The 7:40 orbital ferry to Meridian Ring is delayed by 12 minutes due to docking traffic in Sector 4. Revised boarding will begin at 7:52. Priority access remains available for families with small children, travelers needing mobility assistance, and passengers connecting to Gate 18. Please keep your boarding pass ready and remain behind the illuminated safety line. We appreciate your patience.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.78,
          "similarityBoost": 0.72,
          "style": 0.2,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "on",
        "previousText": "Central terminal update.",
        "nextText": "A follow-up notice will be issued when final boarding is authorized."
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "99441597-92ad-4ee9-8b18-673b406b933c",
  "audioUUID": "ace2b9ac-e489-44fc-ba46-95f5a9916233",
  "audioURL": "https://am.runware.ai/audio/os/a20d05/ws/5/ai/ace2b9ac-e489-44fc-ba46-95f5a9916233.mp3",
  "seed": 32436,
  "cost": 0.0706
}
```