Oh god, not another 550mb app... there are a lot of lightweight alternatives to electron that can provide the same frontend experience if you don't need nodejs: tauri, wails, pywebview...
No, it is labeled as GPT-4, but last time I checked it was using GPT-3.5 under the hood. I asked about something recent that GPT-4 should know, can't remember what exactly, maybe about stable diffusion, and asked not to use the web search and it answered like GPT-3.5
I use a fork of https://github.com/Krivich/GPT-Over-API, I edited it to support recent models and added cost estimation that keeps track of all the money spent on all requests. For most of the tasks ChatGPT3.5 is fine, but for more complex/recent-data related tasks, GPT-4 performs better.
Why this over some fancy ui on the web? Well, this can be hosted locally and will not steal your OpenAI key, and it allows to set max.tokens and select history items on every request.