Anthropic Messages

curl --request POST \
  --url https://api.linkmodel.ai/v1/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "model": "claude-opus-4-5-20251101",
  "messages": [
    {
      "role": "user",
      "content": "Hello, who are you?"
    }
  ],
  "max_tokens": 1024,
  "system": "You are a helpful assistant.",
  "stream": false,
  "stop_sequences": [
    "<string>"
  ],
  "tools": [
    {}
  ],
  "tool_choice": {},
  "thinking": {}
}
'

import requests

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

payload = {
    "model": "claude-opus-4-5-20251101",
    "messages": [
        {
            "role": "user",
            "content": "Hello, who are you?"
        }
    ],
    "max_tokens": 1024,
    "system": "You are a helpful assistant.",
    "stream": False,
    "stop_sequences": ["<string>"],
    "tools": [{}],
    "tool_choice": {},
    "thinking": {}
}
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({
    model: 'claude-opus-4-5-20251101',
    messages: [{role: 'user', content: 'Hello, who are you?'}],
    max_tokens: 1024,
    system: 'You are a helpful assistant.',
    stream: false,
    stop_sequences: ['<string>'],
    tools: [{}],
    tool_choice: {},
    thinking: {}
  })
};

fetch('https://api.linkmodel.ai/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://api.linkmodel.ai/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([
    'model' => 'claude-opus-4-5-20251101',
    'messages' => [
        [
                'role' => 'user',
                'content' => 'Hello, who are you?'
        ]
    ],
    'max_tokens' => 1024,
    'system' => 'You are a helpful assistant.',
    'stream' => false,
    'stop_sequences' => [
        '<string>'
    ],
    'tools' => [
        [
                
        ]
    ],
    'tool_choice' => [
        
    ],
    'thinking' => [
        
    ]
  ]),
  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://api.linkmodel.ai/v1/messages"

	payload := strings.NewReader("{\n  \"model\": \"claude-opus-4-5-20251101\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"Hello, who are you?\"\n    }\n  ],\n  \"max_tokens\": 1024,\n  \"system\": \"You are a helpful assistant.\",\n  \"stream\": false,\n  \"stop_sequences\": [\n    \"<string>\"\n  ],\n  \"tools\": [\n    {}\n  ],\n  \"tool_choice\": {},\n  \"thinking\": {}\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://api.linkmodel.ai/v1/messages")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"model\": \"claude-opus-4-5-20251101\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"Hello, who are you?\"\n    }\n  ],\n  \"max_tokens\": 1024,\n  \"system\": \"You are a helpful assistant.\",\n  \"stream\": false,\n  \"stop_sequences\": [\n    \"<string>\"\n  ],\n  \"tools\": [\n    {}\n  ],\n  \"tool_choice\": {},\n  \"thinking\": {}\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.linkmodel.ai/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  \"model\": \"claude-opus-4-5-20251101\",\n  \"messages\": [\n    {\n      \"role\": \"user\",\n      \"content\": \"Hello, who are you?\"\n    }\n  ],\n  \"max_tokens\": 1024,\n  \"system\": \"You are a helpful assistant.\",\n  \"stream\": false,\n  \"stop_sequences\": [\n    \"<string>\"\n  ],\n  \"tools\": [\n    {}\n  ],\n  \"tool_choice\": {},\n  \"thinking\": {}\n}"

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

{
  "id": "msg_abc123",
  "type": "message",
  "role": "assistant",
  "model": "claude-opus-4-7",
  "content": [
    {
      "type": "text",
      "text": "I'm Claude, an AI assistant made by Anthropic."
    }
  ],
  "stop_reason": "end_turn",
  "stop_sequence": "<string>",
  "usage": {
    "input_tokens": 12,
    "output_tokens": 18
  }
}

{
  "code": 400,
  "msg": "max_tokens is required",
  "request_id": "96be7a7d-3e81-4916-a6b8-19b32773a693"
}

{
  "code": 401,
  "msg": "invalid api key",
  "request_id": "bff4c295-c7da-4507-9708-4627cb6373ba"
}

{
  "code": 500,
  "msg": "message failed: billing: code=100601: insufficient balance",
  "request_id": "3409f6fb-fa9a-4534-b530-195b5f6f4e32"
}