I am also experiencing this and I feel this is very bad experience since I start to subscribe PRO since 2023. The quality of answers in these faster thinking and exploration loses the value I feel ChatGPT is offering over Claude and Gemini. For complex tasks, in the past it was often taking 60-90 mins to get an answer, now collapses to ~10 min, with clearly shallow evidence and reasoning. This may be due to the cost cutting in OpenAI (like closing Sora etc) but I feel this may let OpenAI loosing their most unique customers who frequently use Pro to address complex and long context problems. Simply feel disappoint for ChatGPT if they are doing this for budget cutting.
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