You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.311,
ImprovementsSection of the release
What
Claude Code can cache (store and reuse) parts of a conversation so it does not have to send them again. A cache entry can last 5 minutes or 1 hour. Usage records used to give only one total for tokens written to the cache, cacheCreationInputTokens. They now also carry two optional counts:
cacheCreationEphemeral5mInputTokens, for tokens written to a 5-minute cache.
cacheCreationEphemeral1hInputTokens, for tokens written to a 1-hour cache.
costUSD, the cost estimate, now prices 1-hour cache writes at the 1-hour rate when the price table has one.
Why
The two cache lengths cost different amounts, so splitting them gives a more accurate cost breakdown and estimate.
