ChatGPT o1-mini is silently getting nerfed again (With evidence)

I wish they would be more transparent about their model's outage. Here's a codeforces benchmark as an evidence:

Codeforces problem Rating o1-mini 21/12/2024 o1-mini 18/01/2025 Chat link
2049A 800 Accepted Wrong Answer https://chatgpt.com/share/678b41b8-715c-800e-8d24-d45b89f5b677
2049B 1300 Accepted Wrong Answer https://chatgpt.com/share/678b4579-0234-800e-8944-504c564e0443
2049C 1500 Accepted Wrong Answer https://chatgpt.com/share/678b45be-094c-800e-9306-457e9afb6100
2049D 1900 Accepted Wrong Answer https://chatgpt.com/share/678b44b8-cef0-800e-97f9-16ea45040f7d

For reference, o1-mini is supposed to have 1650 rating but it gave up thinking after 7 seconds and can't even solve a 800 rated problem.

But what if you don't care about codeforces benchmark? Well o1-mini used cout << endl; instead of cout << '\n'; which means they're falling back to chatgpt 4o and you're essentially paying $20 a month for nothing