preserved-thinking changedbuild-with-claude/preserved-thinking
Nearest release: v2.1.316, published under 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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1 Sep 2026
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33url: https://platform.claude.com/docs/en/build-with-claude/preserved-thinking
44description: Preserved thinking lets a model use a thinking block from an earlier turn only if that model or one of a fixed set of other models produced it and nothing before the block has changed.
55featureMetadata:
6 status: ga
6 status: stable
77 supportedModels:
88 - claude-fable-5-1
99 - claude-mythos-5-1
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1111 - claude-sonnet-5-5
1212 - claude-haiku-5-5
1313 supportedPlatforms:
14 Claude API: ga
15 Claude Platform on AWS: ga
16 Claude Models on Google Cloud (Anthropic managed): ga
17 Claude Models on Google Cloud (Google managed): ga
18 Microsoft Foundry: ga
14 Claude API: stable
15 Claude Platform on AWS: stable
16 Claude Models on Google Cloud (Anthropic managed): stable
17 Claude Models on Google Cloud (Google managed): stable
18 Microsoft Foundry: stable
1919---
2020
2121**API support**: Usage differs by product.
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