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> could at least tell you when they're making something up themselves where Bing/Bard seemingly cannot.

In fact GPT-4 is quite good at catching hallucinations when the question-answer pair is fed back to itself.

This isn’t automatically applied already because the model is expensive to run, but you can just do it yourself (or automate it with a plug-in or LangChain) and pay the extra cost.

Remember that the model only performs a fixed amount of computation per generated token, so just asking it to think out loud or evaluate its own responses is basically giving it a scratchpad to think harder about your question.