Thinking mode allows supported models to show their reasoning process before providing the final answer. This feature is currently available for select models like Claude Sonnet 4.

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Basic Usage

To enable thinking mode, add the thinking parameter to your request: 
payload = {
    "model": "claude-sonnet-4-20250514",
    "max_tokens": 16000,
    "thinking": {
        "type": "enabled",
        "budget_tokens": 10000
    },
    "messages": [
        {
            "role": "user",
            "content": "Are there an infinite number of prime numbers such that n mod 4 == 3?"
        }
    ]
}

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Parameters

  • type: Set to "enabled" to activate thinking mode
  • budget_tokens: Maximum number of tokens allocated for the thinking process (optional)

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Supported Models

  • choose models that support thinking like gpt-5, claude-sonnet-4-20250514.

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Response Format

When thinking is enabled, the response will include additional fields showing the model’s reasoning process. See the Log Thinking documentation for details on the response structure.