We ran the same ChatGPT prompt three times in a row. Here is what changed.
We wanted to know how much a single ChatGPT answer can be trusted as a measurement. So we ran the same prompt through ChatGPT more than once, with nothing changed between runs, and recorded what came back each time. The setup We used DataForSEO's ChatGPT LLM Scraper on 2026-08-16. For each prompt we ran the exact same query three times, minutes apart, same settings every time. Nothing about the…
A reporter tested the reliability of ChatGPT's answers by running the same prompt three times, with no changes in between. The results showed that the top brands in the email marketing category held their positions consistently, with Klaviyo always at the top and Omnisend consistently in second place. However, Mailchimp's position varied, appearing in two out of the three runs and being absent in one.
This inconsistency was also observed when testing the stability of results across four different prompts about HTML-to-PDF APIs. The study found that while the top-ranking brands remained stable, many other brands showed significant fluctuations from one run to the next. This inconsistency highlights the unreliability of relying on a single ChatGPT answer for accurate brand visibility measurements.
The reporter emphasizes that a single run can only provide a snapshot of the results and not a comprehensive understanding of brand stability across multiple queries.
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