Anthropic Protocol

Developing

POST

/v1/messages

Request

Authorization

API Key

Add parameter in header

Authorization

Example:

Authorization: ********************

Body Params application/jsonRequired

Examples

Example 1Reasoning

{
    "model": "claude-4.5-sonnet",
    "messages": [
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Hello"
                }
            ]
        }
    ],
    "max_tokens": 1024
}

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

cURL

Example 1Reasoning

curl --location 'https://api-xmodel.nexconn.ai/v1/messages' \
--header 'Authorization: <api-key>' \
--header 'Content-Type: application/json' \
--data '{
    "model": "claude-4.5-sonnet",
    "messages": [
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "Hello"
                }
            ]
        }
    ],
    "max_tokens": 1024
}'

Responses

🟢200Success

application/json

Bodyapplication/json

Example

{
    "id": "msg_f69c4d5d67c64d3bae8865537ee82ee8",
    "type": "message",
    "role": "assistant",
    "model": "claude-4.5-sonnet",
    "content": [
        {
            "type": "text",
            "text": "Hello! Nice to meet you. How can I help you?"
        }
    ],
    "stop_reason": "end_turn",
    "usage": {
        "input_tokens": 10,
        "output_tokens": 29,
        "cache_creation_input_tokens": 0
    }
}

Modified at 2026-04-24 10:39:56

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