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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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token-counting changedbuild-with-claude/token-counting

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First seen 14 Aug 2026 this site's first read of the page
Recorded edits18to this page, all time

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3232<Note>
3333 The token count is an **estimate**. In some cases, the actual number of input tokens used when creating a message might differ by a small amount.
3434 
35 Token counts may include tokens added automatically by Anthropic for system optimizations. **You are not billed for system-added tokens**. Billing reflects only your content.
35 Token counts might include tokens added automatically by Anthropic for system optimizations. **You are not billed for system-added tokens**. Billing reflects only your content.
3636</Note>
3737 
3838### Supported models
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784784<Note>
785785 See [Thinking and the context window](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-and-the-context-window) for more details.
786786 
787 * Thinking blocks from **previous** assistant turns count toward your input tokens on models that [keep all prior turns](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-block-preservation-by-model); on models that keep only the last turn, the API strips them and they do **not** count
788 * **Current** assistant turn thinking **does** count toward your input tokens
787 * Thinking blocks from **previous** assistant turns count toward your input tokens on models that [keep all prior turns](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-block-preservation-by-model); on models that keep only the last turn, the API strips them and they do **not** count.
788 * **Current** assistant turn thinking **does** count toward your input tokens.
789789</Note>
790790 
791791<CodeGroup>
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