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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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thinking-troubleshooting changedbuild-with-claude/thinking-troubleshooting

Nearest release: v2.1.321, published an hour 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 14 Aug 2026 this site's first read of the page
Recorded edits19to this page, all time

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173173* A rebuilt `system` prompt or `tools` array
174174* Client-side compaction that kept recent turns and their thinking verbatim
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176Server-side [compaction](https://platform.claude.com/docs/en/build-with-claude/compaction) and [context editing](https://platform.claude.com/docs/en/build-with-claude/context-editing) never trigger this error. For requests that don’t set `thinking.block_binding.prefix_mismatch_behavior`, see [When `prefix_mismatch_behavior` is unset](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking#enforcement).
176Server-side [compaction at a token threshold](https://platform.claude.com/docs/en/build-with-claude/compaction-threshold) and [context editing](https://platform.claude.com/docs/en/build-with-claude/context-editing) never trigger this error. With [on-demand compaction](https://platform.claude.com/docs/en/build-with-claude/compaction-on-demand), thinking in the turns you keep after the summary triggers it when one of the [conditions for kept thinking](https://platform.claude.com/docs/en/build-with-claude/compaction-thinking-blocks#conditions-for-kept-thinking-to-stay-valid) doesn’t hold. For requests that don’t set `thinking.block_binding.prefix_mismatch_behavior`, see [When `prefix_mismatch_behavior` is unset](https://platform.claude.com/docs/en/build-with-claude/preserved-thinking#enforcement).
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178178Retrying the same request body doesn’t clear the error. Neither does fixing your code, because the stored history holds the edit. To continue the conversation, do one of the following:
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