What
The dialog that asks whether to resume a conversation or start a new one warns how much of your 5-hour usage limit resuming would take. Its "Start a new conversation" option now has a description: "Claude can look this one up if you refer to it later".
Why
It tells you that choosing a fresh conversation instead of an expensive resume does not mean losing what was in the old one.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear whether the lookup this option promises is available to every account.