ChatGPT Custom Instructions: describe the relationship, not your resume
Most people fill Custom Instructions with a LinkedIn resume, "I'm a software engineer, I like bullet points," and it does nothing. Swap in a description of the conversational relationship you want, and three sentences will completely change how the model behaves.
Stop writing what you are. Start writing how you want to be treated. 3 short sentences in Custom Instructions transform the relationship.
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The value of this prompt is meta-level: set it once and it changes every conversation that follows. Most useful for the person who thinks "I'm a power user, but my results are still mediocre." The moment you see the first [uncertain] tag appear, it'll click why this matters more than switching models.
ChatGPT 對話風格徹底轉變：你會看到 reasoning 一句先出、不確定處標 [uncertain]、它開始 disagree、開始質疑你的 framing、不再說「Great question!」開頭、不再「Would you like me to...」結尾
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