How I used ChatGPT-o3 to plan an entire marketing campaign during one plane ride

In an hour, ChatGPT-o3 can make you dozens of high-level marketing graphics — the kinds of campaigns that would take some teams weeks to complete. And the graphics aren’t just a first draft starting point. They’re final assets ready to run.

I tested this out on a recent flight and managed to create an entire 2025 marketing campaign in about an hour. Brainstorming. Prompt writing. Graphics generation and iteration. ChatGPT has evolved from a simple productivity tool into a high-level creative and strategic partner.

The new ChatGPT equation for AI-savvy marketers is this: deep research + your brand standards + o3-generated prompt + in-app editing = full graphics pipeline. I’m going to show you exactly how that looks and offer tips that I found make this process much more effective.

Why ChatGPT-o3 Is a Game Changer

ChatGPT-o3 was released at the end of 2024, and OpenAI has shared big upgrades in 2025. To me, o3 feels very human, and I’m having a ton of fun with the leap forward in image generation. There’s a tangible magic for marketers.

Let’s look at the under-the-radar features of ChatGPT-o3 that should be common knowledge, plus some use cases for 4o image generation.

Improved Prompting

You’ve probably heard many times that AI is only as good as the prompts you give it. Focus on these two things with o3: self-prompting and context.

I think o3 is a fantastic prompt writer, and I’ve gotten in the habit of asking for prompts as a part of every output. They still need to be massaged sometimes, but it’s a big boost, and the output is more unique when compared to generic copy-pasted prompts.

But be warned, this only reaches its potential with enough context. The more context you provide in your chats, the more tailored the output will be. This is an important shift for marketers.

Originally, AI was just aggregating existing ideas from the internet and giving you the average best practice. But now, if you actually work with it, ChatGPT comes up with very unique, specific ideas that are contextual to your needs.

In my case study below, you’ll see exactly how I’m engaging o3 in prompt engineering. This podcast episode also shares tips for improving your output with better prompting:

Library

Welcome to the most under-the-radar feature that ChatGPT added in the last year: The image library. This allows you to store, edit, and iterate images visually. Once you’ve created a graphic, you can go back to any of those threads to edit and iterate further (tips on this in a minute).

There’s so much you can do from this one pane in the ChatGPT interface:

Basic editing and reiteration.
Get a high level of consistency.
Single image creation, all the way to generating entire campaigns.

The library is a game changer for quick edits of your graphics, giving you a beautiful visual display of everything you’ve generated. The thumbnails in my library below look like digital …read more

Source:: HubSpot Blog