why does Claude reference (or claim) 10-20x more sources on research queries vs ChatGPT?

testing side-by-side on the same q, and 4o answered after 46 sources while Opus 4 saw 716 (!)

writer, explorer. wandering through life. https://linktr.ee/rileybeans_eth

ahh interesting when was this upgrade? here's Andrej recent explainer

An attempt to explain (current) ChatGPT versions.

I still run into many, many people who don't know that:
- o3 is the obvious best thing for important/hard things. It is a reasoning model that is much stronger than 4o and if you are using ChatGPT professionally and not using o3 https://t.co/1bQz0frqIc

Andrej Karpathy

ahh interesting when was this upgrade? here's Andrej recent explainer 

https://x.com/karpathy/status/1929597620969951434?s=46

my understanding is May but who knows — Andrej is saying here all deep research is basically o3, even though it's an option within various models?

I believe so, which is an odd UX since it creates confusion. it would be nice if in the chat it also gives a message saying "hey this model was recently updated so you'll get better responses" or "deep research is using this model now"