Yes
only the claude version will work and be, after less prompting, correct
anonzzzies on Hacker News
In the thread “GPT-5 is behind schedule”, replying to this comment
Helped: Business consultants building frontends in real-time with clients.
Got in the way: o1 produced similar but incorrect results requiring more prompting.
… It's fast and no frontend people are needed for it; backend is another system we built which takes a lot longer of course as they are complex business rules. Both claude and o1 turn up something that looks similar but only the claude version will work and be, after less prompting, correct. I don't have shares in either and I want open source to win; we have all open (more open) solutions doing all the same queries and we evaluate all but claude just wins. …