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Doesn't seem like access is available to try "deep research" yet on OpenAI, so I can only speak to what I tried, which was their examples on the blog post (using DeepSeek w/ R1 + Search) and results were pretty similar.

AFAIK OpenAI's current offering uses 4o, and it does a web search and then pipes it into 4o. I'm guessing adding CoT + other R1/o3 like stuff is one of the key effective differences. But time will tell how different it is. Maybe it's a dramatic improvement.

SearchGPT is bad because its underlying model is not a reasoning one. Deepseek one mentioned above is closer to deep research than searchgpt.

Are you unaware that there is a "Deepthink (R1)" button right next to the "Search" button on DeepSeek's Chat app. Its been there for some time, even before all the hype regarding R1.

I'm well aware of that. That is not what openai calls "deep research".