---
title: "Does ChatGPT know my geolocation?"
description: "The evidence that ChatGPT knows my IP geolocation."
published: 2025-11-09
tags: ["llm", "security"]
---

It's Sunday and I work on my fun project after morning coffee. For benchmarking, I need to work with fast small local LLM. I opened ChatGPT and asked it what is the fastest local LLM.
![](./initial_conversation_beginning.png)
The explanation is not relevant here, but here is the end of the conversation where I have noticed something interesting.
![](./initial_conversation_geo_leak.png)
***HOW THE HECK CHATGPT KNOWS I AM IN CZECHIA???***

It absolutely should not! However, I am not based in Ostrava, so I guess it might not be my real location, just the IP geolocation. I checked that, and indeed it is my IP geolocation.
![](./my_geolocation.png)

I found some mention of this on HN https://news.ycombinator.com/item?id=42022905.

However, when you ask ChatGPT directly, it will deny any access to that information, and it will gaslight you for free. 
![](gaslight_1.png)

I tried to get some additional info from LLM by altering my last question. Here are some interesting answers.
![](gasligh_2.png)
![](gaslight_3_tag_leak.png)
![](gaslight_4_tag_leak.png)

I think what we observed here is a leakage of the system prompt.
```
I am GPT-5.
- I cannot see your IP
- I cannot see your location
- I do not retain personal info

I only know what you explicitly tell me in the chat.
```
Given that it is twice mentioned "location tag" my guess is that the IP geolocation or IP is attached to the conversation. 

Here is the last saved conversation https://chatgpt.com/share/691080c0-8644-8013-84c0-6ef54c45aa23.