ElevenLabs TTS v3

Generate text-to-speech audio using Eleven-v3 from ElevenLabs.

Pricing: $100/1m-tokens. Endpoint: POST /v1/models/elevenlabs/tts/eleven-v3/runs.

Generate text-to-speech audio using Eleven-v3 from ElevenLabs.

Overview

• Endpoint: https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs
• Model ID: elevenlabs/tts/eleven-v3
• Provider: ElevenLabs
• License: commercial
• Last Updated: 2026-04-06

Pricing

• Base price: $100/1m-tokens
• Note: Usage-based, per 1000 characters

ElevenLabs TTS v3 API

Endpoint: POST /v1/models/elevenlabs/tts/eleven-v3/runs

Run the model

Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

cURL

curl -X POST https://api.runflow.io/v1/models/elevenlabs/tts/eleven-v3/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "text": "Welcome to the Runflow Lab! This week we shipped five new models and honestly, the hardest part was naming them. Turns out, all the good AI names are taken."
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

Request parameters

Parameter	Type	Required	Description
input	object	required	Model input parameters. See “Input schema” below.
callback_url	string | null	optional	Webhook URL - POSTed when the run reaches a terminal state.
metadata	object | null	optional	Arbitrary key-value pairs attached to the run.

Input schema

Field	Type	Required	Allowed values	Description
text	string	required	Any	The text to convert to speech
voice	string	optional	Any	The voice to use for speech generation
language_code	string	optional	Any	Language code (ISO 639-1) used to enforce a language for the model.
stability	float	optional	Any	Voice stability (0-1)
apply_text_normalization	string	optional	auto, on, off	This parameter controls text normalization with three modes: ‘auto’, ‘on’, and ‘off’. When set to ‘auto’, the system will automatically decide whether to apply text normalization (e.g., spelling out numbers). With ‘on’, text normalization will always be applied, while with ‘off’, it will be skipped.
timestamps	boolean	optional	Any	Whether to return timestamps for each word in the generated speech

Output schema

Field	Type	Description
outputs	json	Unified output array - one entry per generated artifact with url/type/width/height/duration/etc.
model_data	json	Model-specific extra fields (prompt, description, actual_prompt, masks, etc.) keyed by field name.
nsfw_detected	json	true if the provider flagged output as NSFW, false if cleared, null if not checked.
seed	json	Deterministic seed used for generation, or null if the provider doesn’t return one.
timing	json	Provider timing info (inference_ms etc.), or null.

Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.

Field	Type	Description
event	string	Event type: “run.completed”, “run.failed”, or “run.cancelled”.
run_id	string	The unique identifier of the run.
status	string	Terminal status: “succeeded”, “failed”, or “cancelled”.
output	object | null	The run output. Null if the run failed or was cancelled.
duration_ms	number | null	Total run duration in milliseconds.
created_at	string | null	ISO 8601 timestamp when the run was created.
completed_at	string | null	ISO 8601 timestamp when the run reached terminal state.
metadata	object | null	The metadata object passed at run creation, if any.

• Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
• Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

Additional Resources

• Playground
• API Reference
• Documentation
• OpenAPI

Related

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Run lifecycle

Callbacks, polling, statuses.

Callbacks

Handle async results.

Pricing

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