Prompt Caching giảm chi phí API 90%

import anthropic

client = anthropic.Anthropic(
    api_key="izzi-YOUR_KEY_HERE",
    base_url="https://api.izziapi.com/anthropic"
)

SYSTEM_PROMPT = """Bạn là chuyên gia review code Python..."""

def review_code(code: str) -> str:
    response = client.messages.create(
        model="claude-sonnet-4-20250514",
        max_tokens=3000,
        system=[{
            "type": "text",
            "text": SYSTEM_PROMPT,
            "cache_control": {"type": "ephemeral"}
        }],
        messages=[{"role": "user", "content": f"Review code:\n{code}"}]
    )
    
    cached = getattr(response.usage, 'cache_read_input_tokens', 0)
    if cached > 0:
        print(f"💰 Cache HIT: {cached} tokens cached, tiết kiệm 90%")
    
    return response.content[0].text