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Build a ChatGPT o3 Marketing Team | OpenAI Use Cases for Business
Turn ChatGPT o3 into a full-service marketing department for your business—no coding, no agency fees. In this step-by-step demo, The Professor shows how to craft an OpenAI custom GPT with o3, packed with 11 specialist personas, then tests it on real-world marketing tasks that are relevant to business: blogs, social posts, SEO audits, email re-engagement and performance reporting. Perfect for business professionals 40 + who need more output with fewer resources.
What you will learn
Setting up a multi-persona custom GPT inside OpenAI
Delegating tasks to AI roles (marketing manager, copywriter, SEO researcher, etc.)
Uploading brand files so the GPT works in your company context
Using ChatGPT o3 for practical marketing use cases—content, PPC, analytics and design
Tips for fine-tuning prompts and expanding the team
Timestamps
00:00 Intro and live-stream recap
00:41 Why create a GPT marketing team?
01:40 Meet the 11 AI personas
04:17 Building the custom GPT (interface walk-through)
05:26 Writing core instructions and system prompts
09:04 Adding your own brand documents for context
10:19 Test 1 – AI-written blog from mixed sources
12:53 Test 2 – LinkedIn and YouTube community posts
15:02 Test 3 – SEO site audit on a CSV sitemap
16:55 Test 4 – Email sequence to re-engage dormant leads
17:56 Test 5 – Analysing spend versus revenue in a CSV
18:55 Test 6 – Generating testimonial graphics with the designer persona
22:03 Wrap-up, where to download the persona pack, subscribe and next steps
Helpful links
🔗 Download the persona pack & prompts: https://theprofessor.info/documents
🔗 Try “The Marketing Team” GPT in the GPT Store: https://chatgpt.com/g/g-6817c9df67ac8191b93f004ee08f0092-the-marketing-team
Key terms
custom GPTs, ChatGPT o3, OpenAI, marketing, marketing team, ChatGPT use cases, AI marketing automation, AI for business
Use the Free Prompt Builder – https://www.theprofessor.info/promptbuilder (you will need to log in, but it is FREE)
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Get all the Prompts – https://www.theprofessor.info/documents
