The 2.1.299 entry adds idle compaction in the terminal. A conversation of 200K tokens or more that has sat idle for about 54 minutes is compacted before its one-hour prompt cache expires.
In the News: October 15, 2026 (Morning)
Claude Code 2.1.299 compacts a 200K-token session left idle for about 54 minutes, before the prompt cache expires; the default is on and has an opt-out.
Morning edition
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