context-windows changedbuild-with-claude/context-windows
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14 Aug 2026
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5454The following diagram shows how tokens are managed when thinking is enabled on a model that strips previous thinking blocks:
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6060* **Stripping thinking blocks:** On models that strip previous thinking blocks, thinking blocks (shown in dark gray) are generated during each turn's output phase but are not carried forward as input tokens for subsequent turns. You do not need to strip the thinking blocks yourself: if you pass them back, the Claude API strips them automatically.
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6969The following diagram illustrates how tokens are managed when you combine thinking with tool use on a model that strips previous thinking blocks:
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