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GPT-4 finished training in August 2022, before the release of ChatGPT.

If they had announced this sooner hardly anyone on the internet would have noticed. Props to them for adding it now.

Maybe some people weren't aware, but GPT-3 (and GPT-2, before that) APIs had been around for some time when ChatGPT was launched. I joined the private beta in early 2021.

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