follow-up: anthropic quietly switched the default cache TTL from 1 hour to 5 minutes on april 2. here's the data.

last week's token insights post sparked a debate. some said the 5-minute cache TTL i described was wrong. max plan gets 1 hour, not 5 minutes. i checked the JSONLs. the problem is that we're both right every turn in Claude Code logs which cache tier it used: