It seems OpenAI built in a recommendation for OSM when the user asks for coordinates. See ChatGPT Experiments: Summary And Q&A About The Protests In France – The GDELT Project
On that article I see mentions to GMaps and OSM together.
They way these Large Language Models (LLM) work is guessing the most probable next word (or token). Since it was trained with internet data, it’s likely that’s why it’s just printing both, rather than a “built-in” recommendation.