OpenAI has finally unveiled GPT-4, a next-generation large language model that was rumored to be in development for much of last year. The San Francisco-based company's last surprise hit, ChatGPT, was always going to be a hard act to follow, but OpenAI has made GPT-4 even bigger and better.

Yet how much bigger and why it’s better, OpenAI won’t say. GPT-4 is the most secretive release the company has ever put out, marking its full transition from nonprofit research lab to for-profit tech firm.

“That’s something that, you know, we can’t really comment on at this time,” said OpenAI’s chief scientist, Ilya Sutskever, when I spoke to members of the GPT-4 team in a video call an hour after the announcement. “It’s pretty competitive out there.”

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