Anthropic 缓存读：cache_read 对上缓存列

import os
from anthropic import Anthropic

# Official Anthropic SDK only. Key from env. Never paste a key.
# claude-fable-5-1 sticker is $10 / $50; cache read $0.25/M — Fable row only.
# Do not copy those numbers onto MiniMax or Gemma.
client = Anthropic(api_key=os.environ["ANTHROPIC_API_KEY"])

message = client.messages.create(
    model="claude-fable-5-1",
    max_tokens=16,
    system=[
        {
            "type": "text",
            "text": ("You are a billing ledger. Keep answers short. ") * 80,
            "cache_control": {"type": "ephemeral"},
        }
    ],
    messages=[{"role": "user", "content": "Reply with one word: ok"}],
)

usage = message.usage
inp = usage.input_tokens or 0                                # 输入（未命中段）
out = usage.output_tokens or 0                               # 输出
cache_read = usage.cache_read_input_tokens or 0              # 缓存列
cache_write = usage.cache_creation_input_tokens or 0         # 写入，不进缓存列

print("输入", inp)
print("输出", out)
print("缓存", cache_read)
print("cache_write", cache_write)