<img src="https://media.daily.dev/image/upload/s--kYnWhT55--/f_auto/v1767849570/ugc/content_94cc3a63-b315-437c-a30c-075b11b913ac?_a=BAMAMiZW0" alt="image (6)">
If you’re using Claude in the terminal, you can add the ultrathink keyword in your prompt to force deeper, more structured reasoning.
It’s really useful for complex debugging, architecture decisions, or multi-step problem solving where normal responses feel shallow.
Also, I love how the terminal changes color as soon as you type ultrathink — nice visual cue that it’s in deep-think mode 😄

Prince Kumar

Claude's terminal interface supports an "ultrathink" keyword that triggers deeper, more structured reasoning for complex tasks. When added to prompts, it enhances responses for debugging, architecture decisions, and multi-step problem solving. The terminal provides visual feedback by changing colors when ultrathink mode is activated.

using "ultrathink" keyword in Claude

<a href="https://app.daily.dev/princekumar95" data-mention-id="ubQa4zL8noGlmLPVdNR79" data-mention-username="princekumar95" translate="no">@princekumar95</a> I knew only “breathe deeply, take your time”, or define the chain of thoughts, but didn’t know about this single keyword, which replace this 😀. Thanks for the hint, will try it! =)

I just wish it could ultrathink by default so i dont need to type it every time.

The perfect prompt should be:
“ultrathink-ingly make me a ultrathink python web server that ultrathinks”

Nice one, seems that “make no mistakes” is no longer enough