推論トークン

{
  "usage": {
    "prompt_tokens": 150,
    "completion_tokens": 520,
    "total_tokens": 670,
    "completion_tokens_details": {
      "reasoning_tokens": 400
    }
  }
}

{
  "model": "openai/o4-mini",
  "reasoning_effort": "high",
  "messages": [...]
}

import anthropic

client = anthropic.Anthropic(
    api_key="your-arouter-key",
    base_url="https://api.arouter.ai/anthropic",
)

response = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=16000,
    thinking={
        "type": "enabled",
        "budget_tokens": 10000,
    },
    messages=[{"role": "user", "content": "ステップバイステップで解いてください：..."}],
)

from openai import OpenAI

client = OpenAI(
    api_key="your-arouter-key",
    base_url="https://api.arouter.ai/v1",
)

response = client.chat.completions.create(
    model="deepseek/deepseek-r1",
    messages=[{"role": "user", "content": "√2 が無理数であることを証明してください。"}],
)

# 推論内容（プロバイダーが公開している場合）
print(response.choices[0].message.reasoning_content)
# 最終回答
print(response.choices[0].message.content)

response = client.chat.completions.create(
    model="google/gemini-2.5-flash",
    messages=[...],
    extra_body={
        "thinking": {
            "type": "enabled",
            "budget_tokens": 5000
        }
    }
)