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Claude Code CLI restores the ultrathink keyword for extra reasoning

1 article1 sourcesince Oct 29Last article 1h ago ·

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Anthropic's Ado Kukic posts that ultrathink, a keyword for extra reasoning, is back in the Claude Code CLI. A quoted post from @dmwlff says the feature had been turned off for a while because it might confuse users.

That author says they usually run Opus 5.5 on medium effort and use ultrathink on some turns.

Written by AI from the articles below · updated Oct 29, 1:08 AM ET

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Latest developmentOct 29, 12:51 AM ET
Claude Code brings back the ultrathink keyword for extra reasoning

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Oct 29
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    Claude Code brings back the ultrathink keyword for extra reasoning

    AIAnthropic's Ado Kukic posts "ultrathink" with a rainbow emoji, and a quoted post from @dmwlff says ultrathink is back in the Claude Code CLI. The quoted author says the feature was turned off for a while because it might confuse users, and that they usually run Opus 5.5 on medium effort, using ultrathink on some turns for extra reasoning.

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