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How to Use AI to Evaluate and Improve Copy

Getting honest, useful feedback on marketing copy is surprisingly hard — most people around you either don't have the context to assess it properly or are too polite to say it isn't working. AI fills that gap well. People use it to evaluate headlines, landing page copy, email subject lines, ad copy, and product descriptions against specific criteria: does it speak to the right audience, is the value proposition clear, is the call to action compelling, does it differentiate from competitors? AI can also A/B test ideas by generating multiple variations of the same copy element, evaluate copy against a specific brief, and identify the exact words or phrases that are weakening otherwise strong writing.

5 Best Prompts for Evaluating Copy to Ask Claude or ChatGPT

Copy any prompt below and paste it directly into your AI of choice.

  1. Prompt 01 · Critique against a brief

    "Here is my creative brief: [paste brief]. Here is the copy I've written: [paste copy]. Can you evaluate how well the copy delivers on the brief — what it does well, where it falls short, and what specific changes would bring it closer to what the brief is asking for?"

    Best for: ensuring your copy actually does what it was supposed to do.

  2. Prompt 02 · Test the headline

    "Here are [3-5] headline options for [product / article / email / ad]: [list them]. The audience is [who] and the goal is [what]. Can you rank these from strongest to weakest, explain why, and suggest 2-3 alternatives that might outperform them all?"

    Best for: headline decisions where the right choice can dramatically change performance.

  3. Prompt 03 · Identify weak language

    "Here is my copy: [paste]. Can you flag every word or phrase that is vague, generic, overused in marketing, or fails to create a concrete image in the reader's mind — and suggest a stronger replacement for each one?"

    Best for: copy that's technically fine but not punchy or memorable enough.

  4. Prompt 04 · Audience check

    "Here is my copy: [paste]. My target audience is [describe: demographics, pain points, sophistication level]. Does this copy actually speak to them — in their language, addressing their real concerns? What would land better for this specific audience?"

    Best for: making sure you're not writing for yourself instead of your reader.

  5. Prompt 05 · Generate variations for testing

    "Here is my current [headline / subject line / CTA / opening line]: [paste]. Can you generate 5 meaningfully different variations — not just synonym swaps but different angles, different emotional appeals, different structures — that I could test against the original?"

    Best for: building a genuine A/B test rather than guessing which version is better.