Browsing OpenAI's careers page, I'm seeing at most $275k for most positions, so I'm assuming the median is much lower than an average being pulled up by a few rockstar positions.
You must be looking at non tech positions, most of their research/applied role go up to ~550k, and they do offer more than advertised for strong candidates. + hiring cash bonus + equity (which is a lot).
https://openai.com/careers/research-engineer-research-scient...
You also need to take into account equity, since it went up 250% in a year it can be a large amount of someone's compensation.