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curl -X POST 'https://gptproto.com/v1/messages/async' \
-H 'Authorization: YOUR_API_KEY' \
-H 'Content-Type: application/json' \
-H 'Accept: text/event-stream' \
--data '{
    "stream": false,
    "model": "claude-haiku-4-5-20251001",
    "messages": [
        {
            "role":"user",
            "content": [{"type":"text","text": "你好"}]
        }
    ]
}'

{
    "id": "f8b30625-e38d-4950-8e13-76b72cfcb965",
    "status": "pending",
    "type": "message_task"
}

​
Parameters

​
Core Parameters

ParameterTypeRequiredDefaultRangeDescription
streambool✅false-
modelstring✅--Model ID used to generate the response
messagesarray✅[{'role': 'user', 'content': 'Who are you?'}]role list:
user
assistant
system
developer		Array of message objects for the conversation. Each message must have a role (user or assistant) and content.

​
Messages Array Structure

Each message object in the messages array should have the following structure:
FieldTypeRequiredDescription
rolestring✅The role of the message. Can be: user, assistant, system, or developer
contentarray✅The content of the message

​
Content Array Structure

FieldTypeRequiredExampleDescription
typestring✅textThe type of content
textstring✅Hello, who are you!The text content when type is text