> When a caller asks something that isn’t in the knowledge base, the AI doesn’t guess.

I've seen a number of instances of this type of thing in wild, and under the hood it's usually some prompt that asks the llm to gauge confidence in its own answer. And from my admittedly naive understanding of how this all works, this seems extremely unlikely to be accurate. But I'm curious if that's still the case or if I'm operating under pre-2026 information?