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Sweep 09 Oct 2026 · 17:27Z Build v2.1.296 517 read Stable v2.1.287 Latest v2.1.296 Next v2.1.296 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Developer Platform 29 Sep 2026
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compaction-on-demand changedbuild-with-claude/compaction-on-demand

Nearest release: v2.1.285, published 2 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

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First seen 21 Sep 2026 this site's first read of the page
Recorded edits9to this page, all time

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3636From then on the block takes the place of the messages it summarizes. It goes first in `messages`, the summarized messages are removed, and your next turn follows it. Claude sees the summary where those messages were.
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38![On-demand compaction: a request that carries four messages and the compaction parameter returns one compaction block and no reply; on the next request the block comes first in messages in place of those four messages, followed by the next user turn](https://platform.claude.com/docs/images/compaction-on-demand-swap.svg)
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39 ![On-demand compaction: a request that carries four messages and the compaction parameter returns one compaction block and no reply; on the next request the block comes first in messages in place of those four messages, followed by the next user turn](https://platform.claude.com/docs/images/compaction-on-demand-swap.svg)
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4042## Request a summary
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