Kieran’s Substack - The AI Marketing Generalist

Kieran’s Substack - The AI Marketing Generalist

AI Can Now Simulate Purchase Intent with 90% Accuracy

Here’s how to build a digital twin of your customer to test campaigns before they ever launch.

Kieran Flanagan's avatar
Kieran Flanagan
Oct 17, 2025
∙ Paid

A study dropped this week that should be a fascinating read for marketers.

LLMs can now simulate human purchase intent with 90% accuracy.

Researchers at PyMC Labs and Colgate-Palmolive showed that, with the right method, called Semantic Similarity Rating (SSR), large language models like GPT-4o can mirror how real consumers respond to product surveys.

Tha…

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