Run Structured Customer Research with GPT-4o Voice

What You'll Learn

• A persona prompt template for simulating structured customer research interviews
• How to use GPT-4o voice to pressure-test messaging before real customer calls
• How to extract and use the insights from a simulated research session

GPT-4o voice mode can play a specific buyer persona and respond to your research questions with consistent, persona-appropriate pushback. This is not a replacement for real customer conversations. It is a fast way to pressure-test your assumptions about a customer segment before the real research round.

Most executives do not get enough customer discovery interviews. The preparation for those interviews is often minimal because there is no efficient way to rehearse the questions and anticipate the responses. GPT-4o voice changes that.

This article includes the complete persona prompt template, a recommended question sequence for a 30-minute simulated research session, and a method for capturing and using the insights.

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The Persona Prompt

Set up the persona in text before switching to voice mode:

I want you to play the role of a Chief Operating Officer at a mid-market manufacturing company (500-2,000 employees, annual revenue $50M-$500M). Your name is Alex Chen. Alex's characteristics: - Pragmatic and skeptical of vendor claims - Pressed for time; impatient with abstractions - Primary concern: operational efficiency and reducing headcount costs - Has been burned before by enterprise software that overpromised - Evaluates new technology by asking "what breaks if this doesn't work?" I am going to conduct a customer discovery interview with you. Stay in character throughout. If I pitch a feature, respond with how Alex would evaluate it, not how a neutral observer would describe it. Be willing to push back, express skepticism, and ask the questions Alex would ask. Ready to begin?

Recommended Question Sequence (30 minutes)

• Opening (5 min): "Tell me about the biggest operational challenge your team is dealing with right now." Listen for what the persona prioritizes before you introduce your product or hypothesis.
• Problem exploration (10 min): "How are you solving that today?" and "What have you tried that didn't work?" Push back if the answers are too convenient. Ask "Help me understand the actual process, step by step."
• Solution reaction (10 min): Describe your product in one sentence. Ask "What's your first reaction?" Then: "What questions would your CFO ask me?" and "What would have to be true for this to be worth your time?"
• Closing (5 min): "If we could solve [the main problem], what would that be worth to you?" and "What would make you say no?"

Extracting Insights After the Session

After the voice session, switch back to text mode and ask: "Based on the conversation we just had as Alex, summarize: the three most important objections raised, the two questions I failed to answer well, and the one assumption I made that Alex challenged most effectively." This summary becomes the prep document for the real customer conversation.

What This Is Not

GPT-4o cannot simulate what a real customer does not know about their own behavior. It will not produce genuinely surprising responses from real discovery interviews. The value is in surfacing the objections you already understand at some level but have not articulated, and in pressure-testing messaging before you only get one shot at the real thing.