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POST
/
audio
/
speech
Create speech
curl --request POST \
  --url https://openrouter.ai/api/v1/audio/speech \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "input": "Hello world",
  "model": "elevenlabs/eleven-turbo-v2",
  "response_format": "pcm",
  "speed": 1,
  "voice": "alloy"
}
'
import requests

url = "https://openrouter.ai/api/v1/audio/speech"

payload = {
"input": "Hello world",
"model": "elevenlabs/eleven-turbo-v2",
"response_format": "pcm",
"speed": 1,
"voice": "alloy"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({
input: 'Hello world',
model: 'elevenlabs/eleven-turbo-v2',
response_format: 'pcm',
speed: 1,
voice: 'alloy'
})
};

fetch('https://openrouter.ai/api/v1/audio/speech', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
CURLOPT_URL => "https://openrouter.ai/api/v1/audio/speech",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'input' => 'Hello world',
'model' => 'elevenlabs/eleven-turbo-v2',
'response_format' => 'pcm',
'speed' => 1,
'voice' => 'alloy'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}
package main

import (
"fmt"
"strings"
"net/http"
"io"
)

func main() {

url := "https://openrouter.ai/api/v1/audio/speech"

payload := strings.NewReader("{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"response_format\": \"pcm\",\n \"speed\": 1,\n \"voice\": \"alloy\"\n}")

req, _ := http.NewRequest("POST", url, payload)

req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")

res, _ := http.DefaultClient.Do(req)

defer res.Body.Close()
body, _ := io.ReadAll(res.Body)

fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://openrouter.ai/api/v1/audio/speech")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"response_format\": \"pcm\",\n \"speed\": 1,\n \"voice\": \"alloy\"\n}")
.asString();
require 'uri'
require 'net/http'

url = URI("https://openrouter.ai/api/v1/audio/speech")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"response_format\": \"pcm\",\n \"speed\": 1,\n \"voice\": \"alloy\"\n}"

response = http.request(request)
puts response.read_body
"<binary audio data>"
{
"error": {
"code": 400,
"message": "Invalid request parameters"
}
}
{
"error": {
"code": 401,
"message": "Missing Authentication header"
}
}
{
"error": {
"code": 402,
"message": "Insufficient credits. Add more using https://openrouter.ai/credits"
}
}
{
"error": {
"code": 404,
"message": "Resource not found"
}
}
{
"error": {
"code": 429,
"message": "Rate limit exceeded"
}
}
{
"error": {
"code": 500,
"message": "Internal Server Error"
}
}
{
"error": {
"code": 502,
"message": "Provider returned error"
}
}
{
"error": {
"code": 503,
"message": "Service temporarily unavailable"
}
}
{
"error": {
"code": 524,
"message": "Request timed out. Please try again later."
}
}
{
"error": {
"code": 529,
"message": "Provider returned error"
}
}

Authorizations

Authorization
string
header
required

API key as bearer token in Authorization header

Body

application/json

Text-to-speech request input

input
string
required

Text to synthesize

Example:

"Hello world"

model
string
required

TTS model identifier

Example:

"elevenlabs/eleven-turbo-v2"

voice
string
required

Voice identifier (provider-specific).

Example:

"alloy"

provider
object

Provider-specific passthrough configuration

response_format
enum<string>
default:pcm

Audio output format

Available options:
mp3,
pcm
Example:

"pcm"

speed
number<double>

Playback speed multiplier. Only used by models that support it (e.g. OpenAI TTS). Ignored by other providers.

Example:

1

Response

Audio bytes stream

Raw audio bytestream. Content-Type varies by requested format (audio/mpeg for mp3, audio/pcm for pcm — 16-bit little-endian).