Chatgpt plus O3 mini Chain-of-Thought (CoT) time significantly decreased

ChatGPT
1

I’ve observed that my chatgpt plus account Chain-of-Thought (CoT) time has significantly decreased, and with that, the quality of the responses has noticeably declined.
In past it work right as below picture:

image
image1305×288 17.2 KB

Now it even failed in below task：how many r in strawberry；which O3 mini should output right answer.
The image shows a chat with ChatGPT, where a user asks "how many r in strawberry," and the response includes unnecessary reasoning about elements and concludes that "strawberry" contains two "r"s. (Captioned by AI)
The image shows a chat with ChatGPT, where a user asks "how many r in strawberry," and the response includes unnecessary reasoning about elements and concludes that "strawberry" contains two "r"s. (Captioned by AI)1366×608 39 KB

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My account: easonyuan4540@gmail.com.
Hope it can be fixed soon, thanks!
BR, Eason