So OpenAI recently opened their new /translate page and they somehow leaked that you can actually add a custom system prompt to the request that you make to chat with the model. I thus builded a small tool that did let you override the whole /translate page and make it a custom ChatGPT, i os'ed it here. They fixed it after 1 day...

However it is still possibe to add custom system prompts in the normal chat (premium, free and no accounts). This goes way beyond the current settings that you can set in your chatgpt settings. It intercepts into the request and adds the system prompt. You can find the tool here. Also need to say that this does not override the master system prompt but already changes the model completely.

I also opensourced it here, so you can have a look. https://github.com/jonathanyly/injectGPT