Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Prompt CacheArea: what it touches
Internal ChangesKind: in v2.1.293,
Internal ChangesSection of the release
What
Claude Code keeps a running record of the requests a session sends. That record now stores the last prompt you typed. Its notes on cache timing now also include which model was used and when the request was sent. A prompt cache is a short-lived store that lets repeated parts of a conversation be reused instead of resent. Claude Code can also now check whether the most recent request in the main conversation is still in progress.
Why
These details feed the logic that keeps the prompt cache from expiring.