Every time you open ChatGPT, Claude, or Gemini, it starts completely fresh. No memory of who you are, what you do, how you like to communicate, or what industry you work in. You're just another anonymous user.

That's the default. And it explains why so many people get generic, over-explained, slightly-off answers — even from powerful AI models.

The fix is called custom instructions. It takes about five minutes to set up, and it changes every conversation after that.

What Custom Instructions Actually Do

Custom instructions are a block of text you write once and save in your AI tool's settings. From that point on, every conversation starts with that context already loaded. The AI knows who you are before you say a word.

Instead of writing: "I'm a small business owner in the HVAC industry, I prefer direct answers without a lot of explanation, please write in a professional but conversational tone..." at the start of every new chat — you write it once and forget about it.

The result: answers that fit your actual situation instead of answers built for a hypothetical average user.

How to Set It Up in Each Tool

ChatGPT Go to Settings (bottom left) → Personalization → Custom Instructions. You'll see two text boxes: one for what you want ChatGPT to know about you, and one for how you want it to respond.

Claude Go to your profile → Claude's settings → Custom instructions. One text box where you describe yourself and your preferences.

Microsoft Copilot Settings → Personal preferences → About me. Copilot uses this to personalize responses across Microsoft 365.

Gemini Extensions → Gemini settings → About you. Same concept — a text field where you describe your context.

What to Put in Your Custom Instructions

This is where most people get stuck. Here is a framework that works:

Who you are: Your job title, industry, company size, and what you actually do day to day. The more specific, the better. "I'm the owner of a 12-person landscaping company in the mid-Atlantic region" is far more useful than "I run a small business."

What you use AI for: Your most common tasks. Writing emails, drafting proposals, research, summarizing documents, planning? Tell it explicitly.

How you want answers: Length preference, tone, format. Do you want bullet points or prose? Short answers or full explanations? Direct and blunt, or polished and professional?

What to avoid: Things that slow you down. "Never start with a compliment about my question." "Don't add a disclaimer at the end of every answer." "Skip the preamble — just give me the answer."

A Simple Example

Here is what a solid custom instruction might look like for a small business owner:

I own a residential painting company with 8 employees. I use AI primarily for writing customer emails, creating job estimates, and drafting training materials for my crew. I prefer direct, plain-language responses. Bullet points are fine. Keep responses concise — if I need more detail I will ask. Do not over-explain basic concepts. I have a high school education and run a profitable business; I am not a beginner, just not a tech person.

That context alone will improve your results noticeably. You are no longer talking to an AI that thinks you might be a college student writing an essay.

The Bigger Picture

Custom instructions are the lowest-effort, highest-return thing you can do to get better answers from AI tools. But they are just the beginning.

Once your AI knows who you are, the next step is figuring out where AI should actually fit in your operation — which tasks are worth automating, which tools are worth paying for, and where you are leaving time and money on the table.

That is a different conversation. But this is the right place to start.

Want your custom instructions written for you? Use the AI Custom Instructions Generator — answer a few questions and get a ready-to-paste prompt in under three minutes.