Nov 11, 2026 • 1 min read
AI-Assisted Subject Line Generation: Using ChatGPT or Claude to Create 5-10 Options Per Email
Use AI to generate 10 subject line options per email, then self-preview as a reader to maximize open rates with curiosity-driven hooks.
What is the strategic value?
Subject lines directly control open rates, yet most creators write them last-minute. AI-generated options give you 10 tested angles instead of one guess, turning your biggest email lever into a deliberate, optimized decision that compounds over every send.
Why does the tactic work?
Curiosity-driven subject lines trigger the information-gap effect, compelling readers to open. AI generates diverse angles quickly, while self-previewing shifts your perspective from creator to reader, exposing weak hooks before they cost you opens.
How to implement it?
Write email first. Paste into Claude or ChatGPT. Prompt: 'Give me 10 subject lines and preview text that make someone say ooh, what is this?' Avoid blog-style titles. Pick conversational, curiosity-piquing lines. Send yourself a preview and evaluate as a reader.
Deep dive: Using ChatGPT to Write Email Subject Lines That Skyrocket Your Open Rate to learn more about this strategy.