For example, I needed two rental cars that could each carry seven people for a trip to Maine. There's so many different combinations of ways to search for this that it would take forever to do manually. I have membership in Avis, Hertz, Costco + Chase Reserve Travel, etc. Codex with direct browser usage bypasses most of the web fetch restrictions you get when trying to use the ChatGPT web UI on Pro mode.

I had Codex queue any CAPTCHAs for me to solve. Also set up one sub-agent to search Reddit for other people's clever approaches to getting good rental car deals. Ultimately, it found a third party reseller for Avis that had a price of $600 using a discount code for both cars vs $1,100 cheapest from Avis directly. I would not have discovered that on my own, at least not without like a week's worth of manual searching. So right there that was a $1,000 saving for both cars in exchange for 20 minutes of writing a decent Codex prompt.