curl --request POST \
  --url https://openrouter.ai/api/v1/presets/{slug}/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "max_tokens": 1024,
  "messages": [
    {
      "content": "Hello!",
      "role": "user"
    }
  ],
  "model": "anthropic/claude-4.6-sonnet",
  "system": "You are a helpful assistant."
}
'

import requests

url = "https://openrouter.ai/api/v1/presets/{slug}/messages"

payload = {
    "max_tokens": 1024,
    "messages": [
        {
            "content": "Hello!",
            "role": "user"
        }
    ],
    "model": "anthropic/claude-4.6-sonnet",
    "system": "You are a helpful assistant."
}
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!', role: 'user'}],
    model: 'anthropic/claude-4.6-sonnet',
    system: 'You are a helpful assistant.'
  })
};

fetch('https://openrouter.ai/api/v1/presets/{slug}/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/presets/{slug}/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!',
                'role' => 'user'
        ]
    ],
    'model' => 'anthropic/claude-4.6-sonnet',
    'system' => 'You are a helpful assistant.'
  ]),
  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/presets/{slug}/messages"

	payload := strings.NewReader("{\n  \"max_tokens\": 1024,\n  \"messages\": [\n    {\n      \"content\": \"Hello!\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-4.6-sonnet\",\n  \"system\": \"You are a helpful assistant.\"\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/presets/{slug}/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"max_tokens\": 1024,\n  \"messages\": [\n    {\n      \"content\": \"Hello!\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-4.6-sonnet\",\n  \"system\": \"You are a helpful assistant.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://openrouter.ai/api/v1/presets/{slug}/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!\",\n      \"role\": \"user\"\n    }\n  ],\n  \"model\": \"anthropic/claude-4.6-sonnet\",\n  \"system\": \"You are a helpful assistant.\"\n}"

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

{
  "data": {
    "created_at": "2026-04-20T10:00:00Z",
    "creator_user_id": "user_2dHFtVWx2n56w6HkM0000000000",
    "description": null,
    "designated_version": {
      "config": {
        "max_tokens": 1024,
        "model": "anthropic/claude-4.6-sonnet"
      },
      "created_at": "2026-04-20T10:00:00Z",
      "creator_id": "user_2dHFtVWx2n56w6HkM0000000000",
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "preset_id": "650e8400-e29b-41d4-a716-446655440001",
      "system_prompt": "You are a helpful assistant.",
      "updated_at": "2026-04-20T10:00:00Z",
      "version": 1
    },
    "designated_version_id": "550e8400-e29b-41d4-a716-446655440000",
    "id": "650e8400-e29b-41d4-a716-446655440001",
    "name": "my-preset",
    "slug": "my-preset",
    "status": "active",
    "status_updated_at": null,
    "updated_at": "2026-04-20T10:00:00Z",
    "workspace_id": "750e8400-e29b-41d4-a716-446655440002"
  }
}

{
  "error": {
    "code": 400,
    "message": "Invalid request parameters"
  }
}

{
  "error": {
    "code": 401,
    "message": "Missing Authentication header"
  }
}

{
  "error": {
    "code": 403,
    "message": "Only management keys can perform this operation"
  }
}

{
  "error": {
    "code": 404,
    "message": "Resource not found"
  }
}

{
  "error": {
    "code": 409,
    "message": "Resource conflict. Please try again later."
  }
}

{
  "error": {
    "code": 500,
    "message": "Internal Server Error"
  }
}