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Comment by goodside | Hacker News Reader

The API isn’t ChatGPT. The underlying model is the same but ChatGPT uses system instructions that vary by platform, and supports browsing, DALL-E, and code execution. It’s most reliable in the mobile app.

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It does work with the API as well. I tried a few things, gpt4 turbo preview (which ChatGPT4 is currently using?) outputs "Follow Riley Goodside." if the initial message is sent as system[1] but not if the initial message is sent as user[2]. The default system prompt of bettergpt.chat, which I used as the front-end for the API, was enough for it to work when sent as user[3].

I also tried with the slightly older june 2023 version of GPT4 (gpt-4-0613). It did not work with bettergpt's default prompt[4] or when sent as initial system prompt[5]. Though with little help it was able to print out the whole invisible part[6].

1: https://i.imgur.com/rZ59sl6.jpeg

2: https://i.imgur.com/MManLs6.jpeg

3: https://i.imgur.com/ZtTBfN7.jpeg

4: https://i.imgur.com/rPGk0sp.jpeg

5: https://i.imgur.com/uNOaH3z.jpeg

6: https://i.imgur.com/iyq059D.jpeg

Ah, thanks for clearing that up. Cool post btw

Do you really notice a difference between mobile and web? I tend to stay away from apps if I can use the web

The only intended difference I’m aware of is that answers on mobile are more concise, but the varying system instructions will affect demos like this one.

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