API reference · ElevenLabs

elevenlabs/v4-turbo

Integrate this model through SandBase's unified API, with production-ready schemas and examples.

AUDIOAsyncOpen model

Production endpoint

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OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDelevenlabs/v4-turbo

Input Schema

9 parameters · 1 required · 8 optional

Parameter	Type	Required	Description
`text`	string	Required	The text to convert to speech. Supports audio tags such as [whispering] and IPA pronunciation enclosed in forward slashes. · Min length: 1 · Max length: 5000
`seed`	integer	Optional	Seed for best-effort reproducibility. Identical output is not guaranteed. · Min: 0 · Max: 4294967295
`voice`	string	Optional	The voice to use for speech generation · Default: "Rachel"
`stability`	number	Optional	Voice stability. Lower values allow more expressive delivery; higher values make delivery more consistent. · Min: 0 · Max: 1 · Default: 0.5
`timestamps`	boolean	Optional	Whether to return character-level timing information with the generated audio. · Default: false
`language_code`	string	Optional	Language code (ISO 639-1) for speech generation and text normalization.
`output_format`	string	Optional	Output format of the generated audio. Formatted as codec_sample_rate_bitrate. · Options: mp3_22050_32, mp3_44100_32, mp3_44100_64, mp3_44100_96, mp3_44100_128, mp3_44100_192, opus_48000_32, opus_48000_64, opus_48000_96, opus_48000_128, opus_48000_192 · Default: "mp3_44100_128" mp3_22050_32mp3_44100_32mp3_44100_64mp3_44100_96mp3_44100_128mp3_44100_192opus_48000_32opus_48000_64opus_48000_96opus_48000_128opus_48000_192
`similarity_boost`	number	Optional	How closely the output follows the reference voice. Higher values increase similarity but may reduce naturalness. · Min: 0 · Max: 1 · Default: 0.75
`apply_text_normalization`	string	Optional	Whether to normalize text such as numbers and dates before generation. · Options: auto, on, off · Default: "auto" autoonoff

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

const apiKey = process.env.SANDBASE_API_KEY;
const response = await fetch("https://api.sandbase.ai/v1/run", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "elevenlabs/v4-turbo",
    "text": "[excited] Hello! Welcome to Eleven v4.",
    "voice": "Aria",
    "stability": 0.5,
    "timestamps": false,
    "output_format": "mp3_44100_128",
    "similarity_boost": 0.75,
    "apply_text_normalization": "auto"
  }),
});

if (!response.ok) throw new Error(await response.text());
let result = await response.json();
for (let attempt = 0; attempt < 120 && !["completed", "failed", "timeout"].includes(result.status); attempt++) {
  await new Promise((resolve) => setTimeout(resolve, 2_000));
  const poll = await fetch(`https://api.sandbase.ai/v1/run/${result.id}`, {
    headers: { Authorization: `Bearer ${apiKey}` },
  });
  if (!poll.ok) throw new Error(await poll.text());
  result = await poll.json();
}
if (result.status !== "completed") throw new Error(`Generation ended: ${result.status}`);
console.log(result);

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