Concepts
Extended Thinking
Extended thinking is a setting that lets Claude spend real effort working a hard problem through before it starts writing an answer, and it shows you a summary of that work. This is a switch you turn on, not a way of wording your request. It is slower and uses more of your allowance, so it suits genuinely hard questions rather than everyday ones.
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Member lesson
The definition and sources are public. The complete practical lesson is for members.