But none of these previous versions of the tech were pitched to the public. OpenAI also released a previous fine-tuned version of GPT-3.5, called InstructGPT, in January 2022. ![]() ![]() The company makes these models available on its website as application programming interfaces, or APIs, which make it easy for other software developers to plug models into their own code. GPT-3.5 is itself an updated version of GPT-3, which appeared in 2020. ChatGPT is a fine-tuned version of GPT-3.5, a family of large language models that OpenAI released months before the chatbot. Part of the team’s puzzlement comes from the fact that most of the technology inside ChatGPT isn’t new. Jan Leike: I would love to understand better what’s driving all of this-what’s driving the virality. However, our private beta had given us confidence that we had something that people might really enjoy. There have been so many prior attempts at a general-purpose chatbot that I knew the odds were stacked against us. Liam Fedus: We were definitely surprised how well it was received. We work on these models so much, we forget how surprising they can be for the outside world sometimes. Sandhini Agarwal: I think it was definitely a surprise for all of us how much people began using it.
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