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The conversation compaction system now has a separate prompt for summarizing only recent messages when earlier context is retained, avoiding redundant re-summarization of already-kept content.
Evidence
New partial summary prompt (search for "Your task is to create a detailed summary of the RECENT portion")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.