Chat (deep reasoning)

Claude models that support thinking mode are required, such as: claude-sonnet-4-20250514-thinking
Set the thinking parameter as follows:
“thinking”:
{
"type": "enabled",
"budget_tokens": 2048
}

Request

Header Params

Body Params application/json

Example

{
    "model": "claude-sonnet-4-20250514-thinking",
    "max_tokens": 4096,
    "messages": [
        {
            "role": "user",
            "content": "Hello, world"
        }
    ],
    "thinking": {
        "type": "enabled",
        "budget_tokens": 2048
    }
}

Responses

🟢200成功

application/json

Bodyapplication/json

Example

{
    "id": "msg_01NzY1b1U3Vyddchtadhnuti",
    "type": "message",
    "role": "assistant",
    "model": "claude-sonnet-4-20250514",
    "content": [
        {
            "type": "thinking",
            "thinking": "The user has greeted me with \"Hello, world\" which is a classic programming phrase often used as the first program when learning a new language. Since I'm Claude Code, Anthropic's official CLI for Claude, I should respond in a way that's appropriate for a command-line interface tool while being helpful and friendly.",
            "signature": "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"
        },
        {
            "type": "text",
            "text": "Hello! I'm Claude Code, Anthropic's CLI tool for interacting with Claude. \n\nHow can I help you today? I can assist with:\n- Code generation and debugging\n- File operations and project analysis\n- Running commands and scripts\n- General programming questions\n- And much more!\n\nWhat would you like to work on?"
        }
    ],
    "stop_reason": "end_turn",
    "stop_sequence": null,
    "usage": {
        "input_tokens": 53,
        "cache_creation_input_tokens": 0,
        "cache_read_input_tokens": 0,
        "cache_creation": {
            "ephemeral_5m_input_tokens": 0,
            "ephemeral_1h_input_tokens": 0
        },
        "output_tokens": 151,
        "service_tier": "standard"
    }
}