ElevenLabs Eleven v4 API

ElevenLabs Eleven v4: expressive multilingual speech with audio tags, voice selection and delivery controls.

ElevenLabs·AudioAvailable

from$0.072/ 1K chars~~$0.08~~10% off

Model IDelevenlabs-tts-v4

Try in Playground View API

text-to-speechvoicemultilingual

Input

Text

Output

Audio

Provider

3 providers

Stability

0 – 1

Voice similarity

0 – 1

Seed

0 – 4294967295

Last 7 days · not enough recent requests for stats yet.

ElevenLabs Eleven v4 pricing

Prices are per unit; requests without a provider are routed to the cheapest provider that supports your parameters.

Option	Price (USD)
All options	$0.072 / 1K chars 1 Credits~~$0.08~~10% off

Try ElevenLabs Eleven v4 before you integrate

Test output quality, compare provider prices and estimate cost before writing any code.

Provider

Audio

Estimated cost

Input

Text*prompt

0 / 5000

Voicevoice

Stabilitystability

Voice similaritysimilarity_boost

Language codelanguage_code

Seedseed

Output formatoutput_format

Text normalizationapply_text_normalization

Result

Idle

Your generation will appear here.

Provider prices for this request

Enter a prompt to compare provider prices.

ElevenLabs Eleven v4 prompt examples

Ready-to-use prompts. Load one into the playground and tweak it.

Source

Scene

5 prompts

[warmly] Some places give you a room. Others give you a reason to stay. Open the curta

[warmly] Some places give you a room. Others give you a reason to stay. Open the curtains to the ocean. Let breakfast last a little longer. And leave your calendar somewhere you cannot hear it. [softly] The world can wait. Welcome to your next favorite escape.

[excited] Hello! Welcome to Eleven v4

[excited] Hello! Welcome to Eleven v4.

Resort escape ad

Advertising

[warmly] Picture this: the curtains open, and there's nothing but ocean. Breakfast takes as long as you like. Work can wait. [softly] Welcome to your week off.

Documentary narration

Narration

Deep beneath the ice, the water is darker than any night. Yet here, against every expectation, life has found a way to thrive.

Excited game announcer

Character

[excited] Ladies and gentlemen, the final round is about to begin! [whispering] And nobody saw this coming.

ElevenLabs Eleven v4 API reference

Endpoints, request fields and runnable examples for this model.

Base URL

https://01router.com/api/v1

llms.txt

Quick start

Set API_KEY to your project key, then run a sample from your server. Replace example media URLs with your own public URLs.

Auto-routing chooses a provider that supports the request. Select a provider to see its input constraints and pinned request examples.

curl https://01router.com/api/v1/generations \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
  "model": "elevenlabs-tts-v4",
  "input": {
    "prompt": "Welcome back. Let us get started.",
    "voice": "Rachel",
    "stability": 0.5,
    "similarity_boost": 0.75,
    "output_format": "mp3_44100_128",
    "apply_text_normalization": "auto"
  }
}
JSON

# Replace GENERATION_ID with the id returned above; poll until status is "succeeded" or "failed"
curl https://01router.com/api/v1/generations/GENERATION_ID -H "Authorization: Bearer $API_KEY"

Endpoints

Only endpoints relevant to this model are listed. Paths below include /api/v1. Click an endpoint to read its usage.

POST

/api/v1/generations

Create a generation (charges credits) · API key required

GET

/api/v1/generations/{id}

Get a generation; polls the provider while running · API key required

POST

/api/v1/generations/{id}/cancel

Cancel a running generation (credits refunded) · API key required

POST

/api/v1/quote

Price a request on every provider (no charge, no key needed) · Public · no key

GET

/api/v1/models/elevenlabs-tts-v4

Get one model · Public · no key

Authentication

Send your API key as a Bearer token. Requests are billed to the key owner's credits.

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Get an API key

Input

Send JSON with Content-Type: application/json. Model parameters belong inside input; model, provider and callback_url are top-level fields.

Request body

Name	Type	Required	Description
model	string	Yes	"elevenlabs-tts-v4"
provider	string	No	Pin a provider; omit to auto-route to the cheapest. One of: fal \| wavespeed \| openrouter
input	object	Yes	Model parameters, see the input fields below.
callback_url	string	No	Optional public HTTPS webhook URL. The final task result is signed and delivered here; polling remains available.

input · input fields

Required fields are marked explicitly. Other fields use the listed defaults when omitted.

Name	Type	Required	Values	Default
prompt*	string	Yes	maxLength: 5000	—
voice	string	No	—	Rachel
stability	number	No	min: 0 · max: 1	0.5
similarity_boost	number	No	min: 0 · max: 1	0.75
language_code ISO 639-1, e.g. en or zh	string	No	—	—
seed	integer	No	min: 0 · max: 4294967295	—
output_format	string	No	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	mp3_44100_128
apply_text_normalization	string	No	auto \| on \| off	auto

Callbacks →

Output

Creating a task does not mean generation has finished. Keep its id, poll until succeeded or failed, then read outputs or error. Amounts below are illustrative; actual charges depend on the request.

queued→processing→succeeded / failed

Task submitted

{
  "id": "gen_example",
  "object": "generation",
  "model": "elevenlabs-tts-v4",
  "type": "audio",
  "provider": "fal",
  "status": "processing",
  "input": {
    "prompt": "Welcome back. Let us get started.",
    "voice": "Rachel",
    "stability": 0.5,
    "similarity_boost": 0.75,
    "output_format": "mp3_44100_128",
    "apply_text_normalization": "auto"
  },
  "outputs": [],
  "error": null,
  "credits": 0,
  "price_usd": 0,
  "created_at": "2026-10-25T08:00:00.000Z",
  "completed_at": null
}

Task completed

{
  "id": "gen_example",
  "object": "generation",
  "model": "elevenlabs-tts-v4",
  "type": "audio",
  "provider": "fal",
  "status": "succeeded",
  "input": {
    "prompt": "Welcome back. Let us get started.",
    "voice": "Rachel",
    "stability": 0.5,
    "similarity_boost": 0.75,
    "output_format": "mp3_44100_128",
    "apply_text_normalization": "auto"
  },
  "outputs": [
    "https://example.com/output.wav"
  ],
  "error": null,
  "credits": 0,
  "price_usd": 0,
  "created_at": "2026-10-25T08:00:00.000Z",
  "completed_at": "2026-10-25T08:01:00.000Z"
}

Response fields

Name	Type	Required	Description
id	string	Yes	Generation ID. Use it to query or cancel this task.
object	string	Yes	generation
model	string	Yes	elevenlabs-tts-v4
type	string	Yes	audio
provider	string	Yes	Provider
status	string	Yes	queued → processing → succeeded / failed. Stop polling at either terminal state.
input	object	Yes	Model parameters, see the input fields below.
outputs	string[]	Yes	Result URLs. Empty while processing; read after succeeded and save the files promptly.
error	string \| null	Yes	Failure reason, or null when no failure is reported.
credits	number	Yes	Credits charged for this request.
price_usd	number	Yes	Request price in USD.
created_at	string	Yes	Creation time in ISO 8601 format.
completed_at	string \| null	Yes	Completion time in ISO 8601 format; null before completion.

Get the result

Poll every few seconds until status is succeeded or failed. Output URLs are provider-hosted and may expire — download them promptly. Or pass callback_url to get the result pushed.

curl "https://01router.com/api/v1/generations/GENERATION_ID" \
  -H "Authorization: Bearer $API_KEY"

queued → processing → succeeded / failed. Stop polling at either terminal state. Result URLs. Empty while processing; read after succeeded and save the files promptly.

Cancel a task

Cancellation depends on provider support and task state. A confirmed cancellation returns status: failed and error: Canceled by user. Unsupported or completed tasks return 409 not_cancelable.

curl -X POST "https://01router.com/api/v1/generations/GENERATION_ID/cancel" \
  -H "Authorization: Bearer $API_KEY"

Quote

Same body as creating a generation. Returns every available provider sorted by price, plus the ones that cannot serve the request and why.

curl "https://01router.com/api/v1/quote" -H "Content-Type: application/json" --data-binary @- <<'JSON'
{
  "model": "elevenlabs-tts-v4",
  "input": {
    "prompt": "Welcome back. Let us get started.",
    "voice": "Rachel",
    "stability": 0.5,
    "similarity_boost": 0.75,
    "output_format": "mp3_44100_128",
    "apply_text_normalization": "auto"
  }
}
JSON

Model schema

This public endpoint returns the model parameters and each provider’s supported constraints and prices.

curl "https://01router.com/api/v1/models/elevenlabs-tts-v4"

Errors

Check the HTTP status and error.message. Fix the request before retrying validation or authentication errors. A failed generation is reported in status and error on the task itself.

{
  "error": {
    "message": "Invalid or missing API key",
    "code": "unauthorized"
  }
}

400Invalid body or parameter value

401Missing or invalid API key

402Not enough credits

404Unknown model or generation

409The task cannot be canceled (already finished, or the provider does not support canceling)

429Too many requests — retry after the given seconds

502Every provider rejected the task (credits refunded)

Auth, routing, billing and error codes are covered in →

Use with AI

Give your coding assistant this model reference: endpoints, input constraints, output fields and request examples in plain text.

Open llms.txt

How does ElevenLabs Eleven v4 compare?

Specs and starting prices side by side. Test with the same prompt before you choose.

	ElevenLabs Eleven v4	ElevenLabs Eleven v4 Turbo	Suno V6	Gemini 3.8 Flash TTS
Vendor	ElevenLabs	ElevenLabs	Suno	Google
Starting price	$0.072 / 1K chars	$0.036 / 1K chars	$0.045 / request	$0.041 / 1K chars
Input	Text	Text	Text	Text
Provider	3 providers	3 providers	4 providers	5 providers
Stability	0 – 1	0 – 1	—	—
Voice similarity	0 – 1	0 – 1	—	—
Seed	0 – 4294967295	0 – 4294967295	—	—

ElevenLabs Eleven v4 API FAQ

What do stability and similarity_boost do?

Lower stability makes the delivery more expressive and varied; higher stability keeps it steady. similarity_boost controls how closely the output sticks to the chosen voice. Defaults are 0.5 and 0.75.

Can I direct emotion inside the text?

Yes. Inline audio tags such as [warmly], [whispering], [laughing] or [excited] steer the delivery of the words that follow. They guide the performance but are not guaranteed.

What is the difference between Eleven v4 and v4 Turbo?

v4 is tuned for the most expressive, consistent quality, which suits narration and character work. v4 Turbo trades a little quality for lower latency and about half the price, which suits prototypes and short-form content.

Which output formats and languages are supported?

You can choose MP3, PCM, Opus, μ-law or A-law with output_format (default mp3_44100_128). The model is multilingual; set language_code (ISO 639-1) to force a language.

How is it billed on 01router?

Per 1,000 characters of input text; spaces, punctuation and tags count. See the pricing table for current rates. Failed requests are refunded.

Related models

Other models you can call with the same API key.

Audio · ElevenLabs

ElevenLabs Eleven v4 Turbo

ElevenLabs Eleven v4 Turbo: expressive multilingual speech with audio tags, voice selection and delivery controls.

from $0.036 / 1K charsView API

Audio · Suno

Suno V6

Suno V6 music generation: full songs with vocals or instrumentals from a description, or your own lyrics and style in custom mode. Each request returns two tracks.

from $0.045 / requestView API

Audio · Google

Gemini 3.8 Flash TTS

Google Gemini 3.8 Flash TTS: expressive speech in 30 voices with natural-language style control and inline vocal events like <laugh>.

from $0.041 / 1K charsView API