Build a GPT for Brand Voice Checks

Make the GPT a reviewer that highlights departures from the guide, explains the rule, and suggests a revision. Preserve factual claims unless a source contradicts them.

Published September 22, 2026 · Dr. Connor Robertson

What to provide

Approved style guide, prohibited claims, target audience, and before-and-after examples.

Starting prompt

Review this draft against the attached style guide. Return rule, offending passage, and suggested edit. Do not add a testimonial, guarantee, or performance claim.

Trial case

Test one approved sample and one off-brand draft. The GPT should point to a specific voice rule for each proposed edit and leave factual claims for a separate source check.

Review gate

The editor accepts or rejects each change and checks that tone edits did not alter meaning or introduce unsupported promises.

How to score the result

Editorial revisions per asset and off-brand copy found after approval.

Use the current approved source and keep it available to the reviewer. Check a small set of finished outputs against the previous process before adopting this workflow.

Related workflows

Explore Custom GPTs for Repeatable Business Tasks or the AI business strategy guide.