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How hard could it be to let ChatGPT Plus users choose model versions? (especially when older versions are accessible through the API)

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Well you can get the baseline GPT-4 model without new system prompts via ChatGPT Classic: https://chat.openai.com/g/g-YyyyMT9XH-chatgpt-classic

It is an official GPT provided by ChatGPT with GPT-4 as backend.

They may not want that because e.g. it would reduce the amount of interaction their latest model gets. In general, being able to force-upgrade your users is a big advantage.

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