I tried the same thing with companies in my industry ("list active companies in the field of X") and it came back with a few that have been shuttered for years, in one case for nearly two decades.
I'm really not seeing better performance than with o3-mini.
If anything, the new results ("list active companies in the field of X") are actually worse than what I'd get with o3-mini, because the 4.5 response is basically the post-SEO Google first page (it appears to default to mentioning the companies that rank most highly on Google,) whereas the o3 response was more insightful and well-reasoned.
I'm really not seeing better performance than with o3-mini.
If anything, the new results ("list active companies in the field of X") are actually worse than what I'd get with o3-mini, because the 4.5 response is basically the post-SEO Google first page (it appears to default to mentioning the companies that rank most highly on Google,) whereas the o3 response was more insightful and well-reasoned.