> ## Documentation Index > Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt > Use this file to discover all available pages before exploring further. # ElevenLabs V4 Turbo TTS > The ElevenLabs V4 Turbo TTS API turns up to 5,000 characters into speech with audio tags, 90+ languages, MP3/PCM/Opus output and optional timestamps. > [!TIP] > > 1. After submission, a `task_id` will be returned. If you provided a `callback_url`, when the task status becomes `finished` or `failed`, a POST request will be sent to the `callback_url`. > 2. Regardless of whether `callback_url` is provided, you can retrieve the result through the unified [Query Task Status](https://docs.vidgo.ai/api-manual/task-management/status.md) endpoint. ElevenLabs V4 Turbo TTS is the faster, lower-cost Eleven v4 text-to-speech model. It reads up to 5,000 characters per request in 90+ languages with the same voice, stability, audio-tag and output-format controls as Eleven v4, so it fits high-volume narration, app voice prompts, notifications and drafts you may later re-render with Eleven v4. Eleven v4 and Eleven v4 Turbo are ElevenLabs text-to-speech models released together in September 2026. They take the same request fields on Vidgo: [ElevenLabs V4 TTS](https://docs.vidgo.ai/api-manual/music-series/elevenlabs-tts-eleven-v4.md) is the most expressive option, and [ElevenLabs V4 Turbo TTS](https://docs.vidgo.ai/api-manual/music-series/elevenlabs-tts-eleven-v4-turbo.md) is the faster, lower-cost variant. ## Models * **elevenlabs/tts/eleven-v4-turbo** — Eleven v4 Turbo text-to-speech, the faster and lower-cost variant. ## Features * Text-to-speech for up to 5,000 characters per request. * Inline audio tags in `text` for emotion, pauses and non-verbal sounds. * Any ElevenLabs voice by name or voice ID, with `stability` and `similarity_boost` tuning. * 90+ languages, with an optional `language_code` hint. * 19 output formats across MP3, PCM, μ-law, A-law and Opus. * Optional timestamps for subtitles and lip-sync. ## Required parameters * `text` (string): The text to speak, 1–5,000 characters, not blank. Audio tags in square brackets, such as `[whispers]`, are allowed. ## Optional parameters * `voice` (string): ElevenLabs voice name or voice ID. Default `Rachel`. See [Voice Presets](#voice-presets). * `stability` (number): `0`–`1`. Default `0.5`. Lower values are more expressive, higher values more consistent. * `similarity_boost` (number): `0`–`1`. Default `0.75`. How closely the output follows the selected voice. * `output_format` (string): One of 19 MP3, PCM, μ-law, A-law and Opus formats. Default `mp3_44100_128`. See [Output Formats](#output-formats). * `apply_text_normalization` (string): `auto`, `on` or `off`. Default `auto`. Controls whether numbers, dates and abbreviations are spelled out. * `timestamps` (boolean): Also return timing data for the speech. Default `false`. * `language_code` (string): ISO 639-1 language hint, such as `en`, `zh` or `ja`. Omit it to let the model detect the language. ## Output The finished task returns the speech as an audio file in the `files` array of [Query Task Status](https://docs.vidgo.ai/api-manual/task-management/status.md) and the callback payload. With `timestamps: true`, the timing data is returned as an additional item in the same array. ## Output Formats | Family | Values | | - | - | | MP3 | `mp3_22050_32`, `mp3_44100_32`, `mp3_44100_64`, `mp3_44100_96`, `mp3_44100_128` (default), `mp3_44100_192` | | PCM | `pcm_8000`, `pcm_16000`, `pcm_22050`, `pcm_24000`, `pcm_44100`, `pcm_48000` | | Telephony | `ulaw_8000`, `alaw_8000` | | Opus | `opus_48000_32`, `opus_48000_64`, `opus_48000_96`, `opus_48000_128`, `opus_48000_192` | The value reads as codec, sample rate in Hz and, for compressed formats, bitrate in kbps. `pcm_*` suits further audio processing; `ulaw_8000` and `alaw_8000` suit phone systems. ## Voice Presets `voice` accepts any ElevenLabs voice name or voice ID available to the model. Commonly used names include `Aria`, `Roger`, `Sarah`, `Laura`, `Charlie`, `George`, `Callum`, `River`, `Liam`, `Charlotte`, `Alice`, `Matilda`, `Will`, `Jessica`, `Eric`, `Chris`, `Brian`, `Daniel`, `Lily`, `Bill`, `Rachel`. The default is `Rachel`. ## Examples * **Notification prompt**: a short transactional message with `voice: Brian` and the default MP3 output. * **French narration as Opus**: `language_code: fr`, `output_format: opus_48000_64` for compact app audio, with a `callback_url`. ## Notes * Credits are reserved at submission and depend on the number of characters in `text` as sent, including spaces, line breaks and audio tags. A failed task is refunded in full. See the [pricing page](https://vidgo.ai/apis/api-pricing) for current rates. * `text` is limited to 5,000 characters per request. Split longer scripts into several tasks. * This endpoint produces a single voice per request. Multi-speaker dialogue, voice cloning, streaming, `seed` and `speed` are not available through it; unsupported fields return 400. * Turbo is billed at a lower rate than [ElevenLabs V4 TTS](https://docs.vidgo.ai/api-manual/music-series/elevenlabs-tts-eleven-v4.md); the request body is identical, so you can switch by changing `model`. ## OpenAPI ````yaml api-manual/music-series/elevenlabs-tts-eleven-v4-turbo.json POST /api/generate/submit openapi: 3.0.0 info: title: Vidgo API - ElevenLabs V4 Turbo TTS description: >- The ElevenLabs V4 Turbo TTS API turns up to 5,000 characters into speech with audio tags, 90+ languages, MP3/PCM/Opus output and optional timestamps. version: 1.0.0 servers: - url: https://api.vidgo.ai description: Production server security: - BearerAuth: [] paths: /api/generate/submit: post: tags: - Audio Series summary: ElevenLabs V4 Turbo TTS description: >- Send only the `input` fields listed for this model. Any other field, such as `seed`, `speakers` or `speed`, returns 400. `model` and `callback_url` go at the request root. operationId: submit_elevenlabs_tts_eleven_v4_turbo requestBody: required: true content: application/json: schema: type: object required: - model - input properties: model: type: string description: Model ID. Use `elevenlabs/tts/eleven-v4-turbo`. example: elevenlabs/tts/eleven-v4-turbo callback_url: type: string format: uri nullable: true description: >- Optional public HTTP(S) endpoint that receives a POST when the task becomes `finished` or `failed`. HTTPS is recommended. Omit it, or send `null` or an empty string, to disable callbacks. example: https://your-domain.com/callback input: type: object required: - text properties: text: type: string minLength: 1 maxLength: 5000 example: >- [warmly] Welcome back to the show. [pause] Today we're talking about the oldest lighthouse on the coast. description: >- Text to speak, 1–5,000 characters, not blank. Inline audio tags such as `[whispers]` or `[laughs]` are passed through to the model and count as characters. voice: type: string minLength: 1 default: Rachel description: >- ElevenLabs voice name or voice ID, such as `Rachel`, `Aria` or `Brian`. stability: type: number minimum: 0 maximum: 1 default: 0.5 description: >- Voice stability. Lower values sound more varied and expressive; higher values sound steadier. similarity_boost: type: number minimum: 0 maximum: 1 default: 0.75 description: How closely the output follows the selected voice. output_format: type: string enum: - 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 default: mp3_44100_128 description: >- Audio codec, sample rate and bitrate, written as `codec_samplerate[_bitrate]`. apply_text_normalization: type: string enum: - auto - 'on' - 'off' default: auto description: >- Whether numbers, dates and abbreviations are spelled out before synthesis. `auto` lets the model decide. timestamps: type: boolean default: false description: Also return timing data for the generated speech. language_code: type: string example: en description: >- Optional language hint as an ISO 639-1 code, such as `en`, `zh` or `ja`. Omit it to let the model detect the language. additionalProperties: false description: Generation parameters. examples: notification: summary: Notification prompt value: model: elevenlabs/tts/eleven-v4-turbo input: text: >- Your order has shipped and should arrive on Thursday. Reply STOP to unsubscribe from delivery updates. voice: Brian french_opus: summary: French narration as Opus value: model: elevenlabs/tts/eleven-v4-turbo callback_url: https://your-domain.com/callback input: text: >- Bienvenue ! Votre séance de méditation commence dans trente secondes. Installez-vous confortablement. voice: Charlotte language_code: fr output_format: opus_48000_64 stability: 0.6 responses: '200': description: Task submitted content: application/json: schema: type: object required: - code - data properties: code: type: integer enum: - 200 description: HTTP status code. data: type: object required: - task_id - status - created_time properties: task_id: type: string description: >- Task ID. Use it with [Query Task Status](/api-manual/task-management/status). status: type: string enum: - not_started description: Initial task status. created_time: type: string format: date-time description: Time the task was created (ISO 8601). example: code: 200 data: task_id: task-unified-1762160000-abc123 status: not_started created_time: '2026-11-03T10:30:00' '400': description: >- Invalid input, unsupported field, inaccessible media, or insufficient credits content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '401': description: Invalid credentials content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '403': description: Access denied content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '404': description: Unknown or disabled model content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '408': description: Request timed out content: text/plain: schema: type: string example: Request timeout '422': description: Invalid JSON or non-object request body content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '429': description: Rate or API key credit limit exceeded content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '500': description: Internal error content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '502': description: Unable to create the upstream generation task content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '503': description: The requested model is temporarily unavailable content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. components: securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: API Key description: >- All API endpoints require Bearer Token authentication Get your API Key: Go to **Dashboard → API Key** ([API Key Management Page](https://vidgo.ai/apis/dashboard/api-key)) to get your API Key Add it to the request header: ``` Authorization: Bearer VIDGO_API_KEY ``` ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.