Developer Can Vardar says disabling telemetry in Claude Code cuts prompt cache from 1 hour to 5 minutes

开发者 Can Vardar 发现，Claude Code 里如果关闭遥测（telemetry，即向 Anthropic 回传使用数据），提示缓存时间会从 1 小时骤降到 5 分钟，他算了笔账说这相当于隐私换 12 倍性能，给…

Can Vardar said disabling telemetry in Claude Code drops prompt cache from 1 hour to 5 minutes; Anthropic engineer Boris Cherny said the client then falls back to the 5-minute default because experiment flags stop working. The post says 1-hour cache costs more to write and less to read, so value depends on reuse; Anthropic plans env vars to force 1 hour or 5 minutes.

Why it matters: Strong HKR-H/K/R: the privacy-vs-performance tradeoff is a sharp hook, and the post adds concrete TTL and cache-cost mechanics. It scores as high featured because it affects real Claude Code usage decisions, but not P1 because this is an engineer clarification on X, not a formal,