I wonder if you use opus 5.5 and let it research using the internet what you would get. I use opus 5.5 for legal stuff and it's generally great, but you do have to give it access to the web.
Gemini has access to the web. It should have had access to this, if not even already known some of these rules.
Admittedly, it could be promting issue, lots of context for these decisions.