Prompt caching

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import anthropic
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client = anthropic.Anthropic(
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    base_url="https://api.respan.ai/api/anthropic/",
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    api_key="YOUR_RESPAN_API_KEY",
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)
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message = client.messages.create(
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    model="claude-sonnet-4-20250514",
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    system=[
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      {
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        "type": "text",
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        "text": "You are an AI assistant tasked with analyzing literary works.",
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      },
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      {
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        "type": "text",
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        "text": "<the entire contents of 'Pride and Prejudice'>",
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        "cache_control": {"type": "ephemeral"}
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      }
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    ],
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    messages=[{"role": "user", "content": "Analyze the major themes."}]
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)