揭秘 Agentic AI 缓存失效为何要 1 美元，Claude Code 怎么省钱。
Agentic AI 会话中缓存失效后发送简单的“hi”可能花费 1 美元。这是因为系统需要重新处理百万级 token 的上下文，而非仅处理当前输入。即使发生 1 个 token 的工具调用，cache miss 也需为上下文支付全额价格。Claude Code/Codex 可能会在 200-300K token 处进行上下文压缩以控制成本。
During an agentic session, a quick “hi” after a coffee break can cost a full dollar. But it’s not b...
During an agentic session, a quick “hi” after a coffee break can cost a full dollar. But it’s not because of the “hi.” It’s the million tokens of context you’re repaying for the moment your cache goes cold. Here's the caching math from @evan_a_frick : 0:00 Why you're billed for last turn's context, not just this one 0:17 Cache hits: ~10% of full price 0:41 Agentic AI = way more back-and-forth than chat 1:16 Paying full price for context even on a 1-token tool call 1:40 Cache hit vs. cache miss 2:13 The $1 "hi": walk away for an hour, come back to a cold cache 2:59 Cost grows by the square, even with caching 3:28 How context compaction helps 4:03 Why Claude Code/Codex may compact at ~200-300K, not the full 1M window Your browser does not support the video tag. 🔗 View on Twitter 💬 7 🔄 4 ❤️ 39 👀 4464 📊 12 ⚡