There is almost no chance that it is truthfully based on gpt 4. If you want a free, open source llm with 32k context and generous limits, I recommend using huggingface.co/chat/
The nous-hermes model (you can select different models) is uncensored, and performs really well for a open source model. Plus, they have data controls so you can turn off data gathering per model. Huggingface is a reputable vendor, and doesn't claim to be something it isn't.
I mean, be careful. These llms can be honeypots for data. Like, if you're using it for cover letters, or work, you're sending tons of personal info to random websites.
I would recommend sticking to actual, reputable vendors for llms, or running your own. I have a GTX 1070 and can run some pretty decent models these days locally using koboldai.
Bing is probably the only way to use gpt 4 without paying for it, and Microsoft probably won't steal your bank account info.