For queries in my field (materials science), chatGPT actually seems pretty good about citing real sources, often one of the canonical sources for the topic An

For queries in my field (materials science), chatGPT actually seems pretty good about citing real sources, often one of the canonical sources for the topic An acquaintance who works in the NLP space says this is done in post processing, where GPT probably hallucinates a reference but they run a web query or something to try to fix it up.