I posted a verge article first but then checked and saw the openai blog and posted that. I'd guess it's the officialness / domain that makes ppl click on this so easily.
o3-mini was announced for today, and OpenAI typically publishes in the morning hours (PT). Many people were eagerly waiting. The publication was imminent.
I kept checking both Twitter and Hacker News for updates. Just add ten more people like me and the news will become top news within a few minutes. That is legit.