ChatGPT 3.5 two years ago: hallucinating a different wrong chemical formula three times in a row
lakhvir25 · reddit · 2026-10-25
A Reddit user shared a two-year-old ChatGPT 3.5 screenshot showing early-model hallucination: asked for cardamom seed's chemical formula it answered C17H26O4; for carom seed it said C10H16O; when challenged, it apologized and gave a third fabricated answer, C9H9NO. A striking reminder of how far models have come.
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