All major LLMs have had citation ability for while now. Any time I ask one a question I can't find the answer to, if it's not providing a source, I automatically assume the output is slop. And even then, you still have to be wary, because it will often make something up then cite a semi-related source that doesn't actually contain its claims.

It's had web search ability for about 2 years now. That makes it a fair bit more reliable than before except for when the source it finds is actually irrelevant. But if you're knowledgeable in the domain you're prompting about, it'll usually be easy to figure out. If you're not... Well, good luck.