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The Madison Avenue Field GuideA field guide to marketing & advertising, by Brandon Mina

GlossaryAI in MarketingCustom GPT

AI in Marketing

Custom GPT

A tailored version of ChatGPT configured with specific instructions, files, and tools for a task, such as brand-voice copywriting.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

A custom GPT is a tailored version of ChatGPT configured with specific instructions, reference files and tools for a particular task, such as brand-voice copywriting or answering questions about internal guidelines. It lets teams package repeatable workflows so colleagues get consistent results without writing detailed prompts each time.