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The title is wrong: this is about ChatGPT Plus, not GPT-4.

Specifically, the author is investigating (possible) changes in the system prompt and tools available to the model in the chat interface of ChatGPT Plus. That tells nothing about the model (GPT-4).

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I thought ChatGTP Plus was the choice between GPT3.5 or GPT4… At least it is in mine.

The important and overlooked distinction is that the choice of underlying model in the product ChatGPT is not the same as calling gpt4 via the api.

Sending a prompt into one vs the other, the API sends through the model and back out, the product has censorship watchers and other unknowable bolt-ons.

ChatGPT plus lets you choose between 3.5 and 4 behind the same web client.

As a backend that ChatGPT is built on. There's layers of prompts, and other stuff on top, compared to the raw 3.5 or 4 models.

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