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Sweep 28 Sep 2026 · 18:16Z Build v2.1.284 505 read Stable v2.1.277 Latest v2.1.284 Next v2.1.284 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 28 Sep 2026
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Nearest release: v2.1.284, published under an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 28 Sep 2026 17:53 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 28 Sep 2026 18:07 UTC.

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850850Turn [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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852On models that always think, such as Opus 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.
852On 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.
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854854* **Scope**: [`Any file`](#scopes)
855855* **Type**: Boolean
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31483148#### Command input and output
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3150Claude Code runs the comm
3150Claude Code
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