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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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thinking changedbuild-with-claude/thinking

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1717## How thinking works
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19![Diagram of how thinking works: Claude evaluates the request and decides whether to think up front; with tool use, thinking can recur between tool calls; one response returns thinking blocks, then text blocks](https://platform.claude.com/docs/images/how-thinking-works.svg)
19<Frame>
20 ![Diagram of how thinking works: Claude evaluates the request and decides whether to think up front; with tool use, thinking can recur between tool calls; one response returns thinking blocks, then text blocks](https://platform.claude.com/docs/images/how-thinking-works.svg)
21</Frame>
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2123Whether Claude thinks on a given request, and how deeply, depends on your thinking configuration and the complexity of the request.
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534536Thinking works with [streaming](https://platform.claude.com/docs/en/build-with-claude/streaming). Thinking blocks stream as `thinking_delta` events inside `content_block_delta` events, followed by a single `signature_delta` event just before the block's `content_block_stop`. Text blocks stream afterward as usual.
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536![Diagram of the streaming event sequence with thinking: the thinking block opens, thinking deltas carry text only when the display setting returns text (summarized, or updates for progress-update blocks), a single signature delta closes the block, then text deltas stream](https://platform.claude.com/docs/images/how-thinking-streams.svg)
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539 ![Diagram of the streaming event sequence with thinking: the thinking block opens, thinking deltas carry text only when the display setting returns text (summarized, or updates for progress-update blocks), a single signature delta closes the block, then text deltas stream](https://platform.claude.com/docs/images/how-thinking-streams.svg)
540</Frame>
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538542The following examples stream a response with adaptive thinking, printing thinking and text deltas as they arrive:
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