You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
CompactionArea: what it touches
ImprovementsKind: in v2.1.323,
ImprovementsSection of the release
What
The note shown when you turn on fast mode now ends with " · Fast mode lasts this session only". It used to end with " (this session only)".
A new internal setting can also start writing the summary that /compact uses in the background, once the conversation reaches a chosen size. /compact frees up room by summarizing the conversation so far. This setting is read only from Claude Code's internal flag settings.
Why
The fast mode notice now says outright what lasts only for the session. Starting the summary early means /compact can find it ready instead of making you wait.
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed running /compact again, or after a command such as /context, summarizing away a message that Claude had not answered yet
