I’m curious what these features like study mode actually are. Are they not just using prompts behind this (of which I’ve used many already to make LLMs behave like this) ?

I'm impressed by the product design here. A non-ai-expert could find this mode extremely valuable, and all openai had to do was tinker with the prompt and add a nice button (relatedly, you could have had this all along by prompting the model yourself). Sure, it's easy for competitors to copy, but still a nice little addition.

They state themselves it's just system prompts.

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