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Upstream edited this page at 7 Oct 2026 17:51 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 7 Oct 2026 17:56 UTC.
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859859Turn [extended thinking](/docs/en/model-config#extended-thinking) off for every session by setting this to `false`. Thinking is on by default, so `true` changes nothing. Most people set this through `/config` rather than by editing the file.
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861On models that always think, such as Opus 5.5, Sonnet 5.5, and the Fable models, `false` has no effect. On [third-party providers](/docs/en/third-party-integrations) Claude Code omits the `thinking` parameter instead of turning thinking off, so adaptive-reasoning models may still think. With thinking turned off on the Anthropic API, Claude Code sends effort `high` instead of a higher level to models it knows [don't accept that combination](/docs/en/errors#effort-isnt-available-with-thinking-turned-off), such as Opus 5.
861On models that always think, such as Opus 5.5, Sonnet 5.5, Haiku 5.5, and the Fable models, `false` has no effect. On [third-party providers](/docs/en/third-party-integrations) Claude Code omits the `thinking` parameter instead of turning thinking off, so adaptive-reasoning models may still think. With thinking turned off on the Anthropic API, Claude Code sends effort `high` instead of a higher level to models it knows [don't accept that combination](/docs/en/errors#effort-isnt-available-with-thinking-turned-off), such as Opus 5.
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863863* **Scope**: [`Any file`](#scopes)
864864* **Type**: Boolean
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40534053#### Status line and file suggestion gates
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4055Claude Code makes
4055Claude
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