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

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?

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

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