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It does work well with images you have taken, not just Geoguessr: https://simonwillison.net/2025/Apr/26/o3-photo-locations/

> I’m confident it didn’t cheat and look at the EXIF data on the photograph, because if it had cheated it wouldn’t have guessed Cambria first.

Hm no way to be sure though, would be nice to do another run without Exif information

He did, by rerunning it on a screenshot of the image