MODEL ID elevenlabs:22@1

live

Eleven Flash v2

by ElevenLabs

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.

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:22@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

Starliner Emergency Landing Announcement

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Orbital Docking Bay Advisory

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Submarine Evacuation Bay Briefing

0:00

Request

{
  "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

{
  "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
}

Text to Audio

Arcade Arena Match Countdown

0:00

Request

{
  "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

{
  "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
}