Why does AI calmly make up facts? — Hallucination

AI isn't looking up facts — it just picks the most likely next words, so it can produce wrong sentences with total confidence.

This is called hallucination — it's not an intent to lie, but a limit of a design that builds answers that sound likely.

It's especially likely to get things wrong when you ask about facts that are missing, rare or very new in its training data — always check somewhere else.