ChatGPT with Rob Miles - Computerphile

36 minutesNew to AIFoundationComputerphileChatGPT & LLMs

Computerphile. A long, calm sit-down with AI-safety researcher Rob Miles on why a model that's trained to predict plausible text will always, structurally, sometimes invent facts. Recorded in early 2023, but the underlying mechanism it explains hasn't changed and the framing is still the cleanest way to internalise "it's a fluency engine, not a truth engine."

AI Expert note

Recorded in early 2023, so ignore any dated product references — the fluency-engine-not-truth-engine mechanism it explains hasn't changed, which is why it stays.

What you should get from this

You can explain why a model trained to predict plausible text will sometimes invent facts, no matter how polished it sounds.

Watch or know first

None, though it helps to have seen a short hallucination explainer like the primary pick first.

Last reviewed: May 18, 2026

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