MODEL ID elevenlabs:23@1

live

Eleven Turbo v2

by ElevenLabs

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.

API Options

Platform-level options for task execution and delivery.

taskType string required value: audioInference: Identifier for the type of task being performed

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

outputType string default: URL: Audio output type.

Allowed values 3 values

outputFormat 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 4 values

audioSettings object

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

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.

Properties 3 properties

audioSettings » bitrate bitrate integer min: 8: Audio bitrate in kbps.

audioSettings » channels channels integer default: 2: Number of audio channels. 1 for mono, 2 for stereo.

Allowed values 2 values

audioSettings » sampleRate sampleRate integer: Audio sample rate in Hz.

webhookURL string 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
PLATFORM

deliveryMethod string default: sync

Determines how the API delivers task results.

Allowed values 2 values

: Returns complete results directly in the API response.
: Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse.

Learn more 1 resource

Task Polling
PLATFORM

uploadEndpoint string 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.

// 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 integer min: 60: Time-to-live (TTL) in seconds for generated content. Only applies when outputType is URL.

includeCost boolean default: false: Include task cost in the response.

numberResults 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 string required value: elevenlabs:23@1

Identifier of the model to use for generation.

Learn more 3 resources

seed 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 object required

Settings for speech generation.

Properties 2 properties

speech » text text string max: 30000: Text to convert to speech.

speech » language language string min: 1: Language code for speech generation.

Allowed values 1 value

Provider Settings

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

providerSettings » elevenlabs » textToSpeech textToSpeech object

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

Properties 5 properties

providerSettings » elevenlabs » textToSpeech » voiceSettings voiceSettings object

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

Properties 4 properties

providerSettings » elevenlabs » textToSpeech » voiceSettings » stability stability 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.

providerSettings » elevenlabs » textToSpeech » voiceSettings » useSpeakerBoost useSpeakerBoost boolean: Boosts similarity to the original speaker at a slight increase in computational load and latency.

providerSettings » elevenlabs » textToSpeech » voiceSettings » similarityBoost similarityBoost float min: 0 max: 1: Controls how closely the AI adheres to the original voice when attempting to replicate it.

providerSettings » elevenlabs » textToSpeech » voiceSettings » style style float min: 0 max: 1: Controls style exaggeration of the voice. Higher values amplify the style of the original speaker but may increase latency.

providerSettings » elevenlabs » textToSpeech » previousText previousText string max: 1000: Text that came before the current request. Improves speech continuity when concatenating multiple generations.

providerSettings » elevenlabs » textToSpeech » nextText nextText string max: 1000: Text that comes after the current request. Improves speech continuity when concatenating multiple generations.

providerSettings » elevenlabs » textToSpeech » applyTextNormalization applyTextNormalization string default: auto

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

Allowed values 3 values

: Automatically decides whether to apply text normalization.
: Always applies text normalization.
: Skips text normalization entirely.

providerSettings » elevenlabs » textToSpeech » applyLanguageTextNormalization applyLanguageTextNormalization boolean default: false: Enables language-specific text normalization for proper pronunciation. Currently only supported for Japanese. Warning: can significantly increase latency.

taskType string required value: audioInference: Type of the task.

taskUUID string required UUID v4: UUID of the task.

audioUUID string required UUID v4: UUID of the output audio.

audioURL string URI: URL of the output audio.

audioBase64Data string: Base64-encoded audio data.

audioDataURI string URI: Data URI of the output audio.

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

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

Text to Audio

Harbor Tram Service Bulletin

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Subterranean Evacuation Platform Announcement

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Lighthouse Fog Warning Broadcast

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Orbital Ferry Delay Bulletin

0:00

Request

{
  "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

{
  "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
}