Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Prompt CachingArea: what it touches
Bug FixesKind: in v2.1.300,
Bug FixesSection of the release
What
Prompt caching lets the API reuse earlier parts of a conversation instead of processing them again. A cached part is kept for either 5 minutes or 1 hour. Claude Code labels each response with the cache length it used.
It now checks for 5-minute cache use first. A response that used both lengths is now labelled "5m", where before it was labelled "1h".
Why
Anything that shows or records the cache length will now show 5 minutes for those mixed responses.
