AI Agents vs Custom GPTs: What’s the Difference (And Why This Changes How You Work)

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Sarah Cordiner|30 December 2025

Let’s simplify this, because this is where most people get confused.

1️⃣ Custom GPTs Think and Talk

A custom GPT is text in, text out.

You give it instructions.
It gives you answers, ideas, plans, copy, frameworks, priorities.

2️⃣ AI Agents Take Action

It can:

*Click screens
*Press buttons
*Research
*Move data
*Build things
*Complete tasks

3️⃣ Why Pinning Your GPT Changes Everything

Once you’ve created your custom GPT in ChatGPT, here’s what to do next.

Click View GPT
Open it like a normal chat
Top left, click the dropdown
Select Pin to sidebar

4️⃣ How This Actually Works Day to Day

Every morning, I:

*Copy all my messy, random, chaotic tasks
*Paste them into my to-do list prioritisation bot
*Hit send

The bot reprioritises everything based on:
*urgency
*revenue impact
*strategic importance

5️⃣ Why This Stops Overwhelm

Most business owners aren’t overwhelmed because they have too much to do.

They’re overwhelmed because they’re deciding what to do next all day long.

This removes that cognitive load completely.

6️⃣ Gemini Does the Same Thing (Just Different Language)

Custom GPTs in ChatGPT are called Gems in Gemini.

Same idea.
Same function.
Different ecosystem.

Inside Gemini:

*Click Gems on the left
*Create a new Gem
*Paste in the same instructions

Upload your strategic plan if you want deeper prioritisation

Done.

Join: sarahcordiner.com/legends

Sarah x

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