> Perplexity gets this right

Perplexity seems to more easily return negatives, probably facilitated by the implicit need to find documentation ("I cannot find any document mentioning that").

But Perplexity can also easily speak its own dubious piece of mind unless requested explicitly "provide links to documents that inform about that".

Perplexity will; search and storage products will fail to find it, and the LLM will se the deviation between the query and the find. So, this challenge only works against the model alone :)