LearnGPT creator launches tool comparing 492 original ChatGPT answers with GPT-6 Astra
mhmazur · x · 2026-10-19
Shortly after ChatGPT launched, Matt Mazur built LearnGPT, one of the first prompt-sharing sites (demoed by Karpathy in his "Let's build GPT" video). He now launched a tool that compares 492 of those original ChatGPT responses side-by-side with how GPT-6 Astra answers the same prompts today.
- Prompts range from "Sell me this pen" to "explain quantum theory to a child in the style of Snoop Dogg."
- A button downloads the full dataset as a ZIP for anyone to analyze or run through other models.
- Mazur also used Claude Opus 5.5 to produce a one-minute intro video for the tool.
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