Outside of benchmarks it's really not as big of a deal as openAI wants you to think it is. In most cases it's slightly better than Claude, except it uses 50x the tokens repeating info to itself and is way slower. There are a lot of people that tried o1 online and are posting screenshots of it making basic mistakes or gaslighting itself in its chain of thought. Not to mention you only get 30 messages PER WEEK since it's such a waste of energy.
It's a desperate attempt by openAI to stay relevant now that competitors and even free models are catching up.