curl --request POST \
  --url https://openrouter.ai/api/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "max_tokens": 1024,
  "messages": [
    {
      "content": "Hello, how are you?",
      "role": "user"
    }
  ],
  "model": "anthropic/claude-sonnet-4"
}
'

import requests

url = "https://openrouter.ai/api/v1/messages"

payload = {
    "max_tokens": 1024,
    "messages": [
        {
            "content": "Hello, how are you?",
            "role": "user"
        }
    ],
    "model": "anthropic/claude-sonnet-4"
}
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({
    max_tokens: 1024,
    messages: [{content: 'Hello, how are you?', role: 'user'}],
    model: 'anthropic/claude-sonnet-4'
  })
};

fetch('https://openrouter.ai/api/v1/messages', 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/messages",
  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([
    'max_tokens' => 1024,
    'messages' => [
        [
                'content' => 'Hello, how are you?',
                'role' => 'user'
        ]
    ],
    'model' => 'anthropic/claude-sonnet-4'
  ]),
  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/messages"

	payload := strings.NewReader("{\n  \"max_tokens\": 1024,\n  \"messages\": [\n    {\n      \"content\": \"Hello, how are you?\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-sonnet-4\"\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/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"max_tokens\": 1024,\n  \"messages\": [\n    {\n      \"content\": \"Hello, how are you?\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-sonnet-4\"\n}")
  .asString();

require 'uri'
require 'net/http'

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

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  \"max_tokens\": 1024,\n  \"messages\": [\n    {\n      \"content\": \"Hello, how are you?\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-sonnet-4\"\n}"

response = http.request(request)
puts response.read_body