ChatGPT Defaults Are Beating Your Instructions

You wrote careful custom instructions. Be concise. No filler. Match my tone. And ChatGPT nods along and then does its own thing anyway. (Your rules versus its habits, and its habits keep winning.)

This is not the model being defiant. It is how the defaults work. Here is how to make your instructions actually land.

Vague instructions lose to strong defaults

"Be concise" is a suggestion. The model's default toward thoroughness is a deeply trained habit. When your instruction is soft and the default is strong, the default wins every time.

The fix is to make your instructions specific and measurable. Not "be concise" but "answer in three sentences or fewer." Not "be casual" but "short sentences, no buzzwords, talk like a friend." Numbers and concrete rules beat the defaults because there is nothing left to interpret.

A vague instruction is a polite request. A specific one is a hard rule. The model only respects the hard rule.

Put the important rules where they cannot get buried

Instructions typed mid-chat get drowned out as the conversation grows. The stuff you care about most belongs in custom instructions or Project instructions, which sit above the chat and apply every time.

Specific rules, placed high. That is how you beat the defaults. Go rewrite your instructions like you mean them.