---
title: Eleven Flash v2 | Runware Docs
url: https://runware.ai/docs/models/elevenlabs-flash-v2
description: Ultra low latency English speech for real time apps
---
# Eleven Flash v2

Eleven Flash v2 is an earlier English speech model that delivers very low latency and clear audio. It is built for live streaming use cases. It also fits real time gaming and interactive tools where rapid voice feedback is critical.

- **ID**: `elevenlabs:22@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-flash-v2#request-tasktype)

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

Identifier for the type of task being performed

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

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

Audio output type.

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

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

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

Audio bitrate in kbps.

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

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

Audio sample rate in Hz.

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

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

Include task cost in the response.

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

- **Type**: `string`
- **Required**: true
- **Value**: `elevenlabs:22@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-flash-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-flash-v2#request-speech)

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

Settings for speech generation.

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

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

Text to convert to speech.

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

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

Type of the task.

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

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

UUID of the task.

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

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

UUID of the output audio.

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

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

URL of the output audio.

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

- **Type**: `string`

Base64-encoded audio data.

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

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

Data URI of the output audio.

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

- **Type**: `float`

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

## Examples

### Starliner Emergency Landing Announcement (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-flash-v2/7d2d18e1-0a79-47d7-9fd1-99a6cd5a0fe2.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "c7038cf6-65d4-4217-9e40-6389792f7986",
  "model": "elevenlabs:22@1",
  "seed": 63729,
  "speech": {
    "text": "Attention passengers: this is First Officer Mira Chen speaking. We are beginning an unscheduled descent into Halcyon Bay due to a cooling fault in the port engine. Please remain seated, secure all loose items, and keep the aisle clear for crew movement. Cabin pressure is stable. There is no fire on board, and landing support is already in position. If you are traveling with a child, keep them close and speak calmly. We expect touchdown in four minutes. When we stop, do not stand until the cabin lights shift from amber to white. Crew, prepare your stations.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.68,
          "useSpeakerBoost": true,
          "similarityBoost": 0.74,
          "style": 0.31
        },
        "previousText": "Good evening, travelers. We have reached cruising altitude and should arrive ahead of schedule.",
        "nextText": "Thank you for your cooperation. Emergency teams are standing by, and further instructions will follow once the cabin door is cleared.",
        "applyTextNormalization": "auto",
        "applyLanguageTextNormalization": false
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "c7038cf6-65d4-4217-9e40-6389792f7986",
  "audioUUID": "6a0764b9-e54a-4b2a-ba90-f3f417fd40a9",
  "audioURL": "https://am.runware.ai/audio/os/a05d22/ws/5/ai/6a0764b9-e54a-4b2a-ba90-f3f417fd40a9.mp3",
  "seed": 63729,
  "cost": 0.08718
}
```

---

### Orbital Docking Bay Advisory (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-flash-v2/e8dd1709-0734-4b86-bafc-91287f865df2.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "b124c3ff-fb2f-4926-93e2-ce1272c74c45",
  "model": "elevenlabs:22@1",
  "seed": 31809,
  "speech": {
    "text": "Attention incoming crews, this is Dock Ring Seven traffic control. A micrometeoroid sweep has delayed external loading by four minutes. Approach lanes blue and amber remain open. Cargo pilots, reduce closure rate to point two meters per second and stand by for revised latch timing. Passenger shuttles from Habitat C, keep your seat restraints fastened until the guidance beacons switch from white to green. Maintenance teams, report any hull ping above threshold immediately. We are not in danger, but we are operating on a tighter margin than usual. Thank you for your precision.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.72,
          "similarityBoost": 0.78,
          "style": 0.22,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "auto"
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "b124c3ff-fb2f-4926-93e2-ce1272c74c45",
  "audioUUID": "dff51b48-4de3-4764-a127-d64e641346e9",
  "audioURL": "https://am.runware.ai/audio/os/a23d05/ws/5/ai/dff51b48-4de3-4764-a127-d64e641346e9.mp3",
  "seed": 31809,
  "cost": 0.08869
}
```

---

### Submarine Evacuation Bay Briefing (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-flash-v2/457720ad-e06c-4fe1-888f-fb13733b3a54.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "30b97cf7-234d-4af5-bdfe-aa1fcffb373b",
  "model": "elevenlabs:22@1",
  "seed": 89141,
  "speech": {
    "text": "Attention dive crew: this is Sector Lead Mara Chen with an immediate status update. Pressure fluctuation has been contained in corridor C, but Bay Two remains restricted. If you are assigned to maintenance ring alpha, hold position and await escort. If you are in berths seven through twelve, proceed in single file to the forward muster line and keep your rebreather masks sealed until inspection is complete. Do not use the cargo lift. Repeat, do not use the cargo lift. Medical team, report to intake with thermal blankets and oxygen packs. Engineering team, confirm hatch integrity at checkpoints red, red, green. We have power, we have guidance, and we are not abandoning the station. Stay calm, move quickly, and listen for your section call.",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.42,
          "similarityBoost": 0.78,
          "style": 0.58,
          "useSpeakerBoost": true
        },
        "applyTextNormalization": "auto"
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "30b97cf7-234d-4af5-bdfe-aa1fcffb373b",
  "audioUUID": "279aef9f-3718-4eb9-9519-c9cac78cda22",
  "audioURL": "https://am.runware.ai/audio/os/a17d13/ws/5/ai/279aef9f-3718-4eb9-9519-c9cac78cda22.mp3",
  "seed": 89141,
  "cost": 0.11618
}
```

---

### Arcade Arena Match Countdown (Text to Audio)

[Listen to audio](https://assets.runware.ai/examples/elevenlabs-flash-v2/56281281-a308-446e-a256-d5c8c655eb38.mp3)

**Request**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "f4aaa573-fd8b-4342-bec2-0bf6764adb2b",
  "model": "elevenlabs:22@1",
  "seed": 97183,
  "speech": {
    "text": "Championship round starts in ten seconds. Blue team holds the center lane, red team is flanking through the east tunnel, and the crowd is getting loud. Contest the beacon at zero, watch for the shock mines near the gate, and keep your comms clear. Five, four, three, two, one—match live!",
    "language": "en"
  },
  "providerSettings": {
    "elevenlabs": {
      "textToSpeech": {
        "voiceSettings": {
          "stability": 0.38,
          "similarityBoost": 0.72,
          "style": 0.79,
          "useSpeakerBoost": true
        },
        "previousText": "Welcome back, contenders. The score is tied and everything comes down to this final push.",
        "nextText": "Blue team secures the beacon first, but red is charging in from the lower ramp.",
        "applyTextNormalization": "auto",
        "applyLanguageTextNormalization": false
      }
    }
  }
}
```

**Response**:

```json
{
  "taskType": "audioInference",
  "taskUUID": "f4aaa573-fd8b-4342-bec2-0bf6764adb2b",
  "audioUUID": "1a074a26-a51c-43f4-be4b-885fdb65c263",
  "audioURL": "https://am.runware.ai/audio/os/a04d20/ws/5/ai/1a074a26-a51c-43f4-be4b-885fdb65c263.mp3",
  "seed": 97183,
  "cost": 0.04794
}
```