Impressive project, especially for a day's work!

My site, https://www.emergentmind.com, is similar, though I'm two years in :)

I've found Gemini 2.5 Flash is the best model in terms of speed/cost/quality. Pro is great as well, but probably not necessary for most chat-with-paper functionality.

I'll add too that building an AI layer on top of arXiv is a deep, deep rabbit hole depending on how far you want to take the project. Drop me a note if you want to chat more about my experience with it.

Regardless, thanks for sharing this!