Blog•Apr 9, 2026
ChatGPT Hallucinations Increased This Quarter. How Would You Improve It? | Open AI Interview
ChatGPT’s hallucination rate jumped 18% quarter‑over‑quarter, especially for professional users in medical, legal, and finance domains, after a fine‑tuning update rolled out six weeks ago. The internal definition treats any confidently false statement as a hallucination, yet the current evaluation pipeline only tracks BLEU scores and thumbs‑down ratings, missing factual‑accuracy signals. Candidates interviewing for AI product roles are expected to diagnose the issue across the AI stack rather than propose superficial UI fixes. The post outlines a systematic PQ‑GUP‑SEMS framework to uncover root causes and design targeted mitigations.
