7-day actual usage · April 2026
Every single API call re-reads your entire context: MEMORY.md, SOUL.md, AGENTS.md, USER.md + the conversation. That's hundreds of thousands of tokens re-read on every heartbeat, every cron, every message.
On the subscription, Anthropic eats the cache cost. On API, you pay $0.30 per million cache reads. At 540M reads/week that's $162/week just in cache.