I’ve noticed the same thing at work with Opus 4.8.
ChatGPT on my personal plan does it too. Just yesterday I asked it to give some places fitting a specific criteria. The first was that they were within a 2 hour drive of my city. 75% of the locations it gave me were more than 2x that distance. It kept doing this across multiple difference searches. I tried high and pro with no difference.
GPT 5.5 Pro is worth the increased price of the higher subscription.
That's not surprising, LLMs are bad at pulling hyperspecific facts out of memory. LLMs aren't mapping applications, they're reasoners. Just a poor problem fit
I've found that Gemini with Google maps integration does this pretty well.