I've been running a small monthly study: take ten buyer-intent questions from one industry, ask four AI assistants the identical question, and record every source each one actually read.
The analysis is the easy bit. Set overlap, count the domains, done.
Getting the citations out of four different APIs in a shape you can compare — that's where I lost a weekend. Writing it up because I couldn't find this anywhere when I needed it.
The problem
All four providers will tell you which URLs they used. None of them agree on where to put that, what to call it, or even what a "URL" is.
