I have various OpenAI APIs baked into about 18 "copilots"; some are driven by Text Blaze, and many are engaged through various apps. I build everything as a "copilot" which is to say, I never actually use the experimental apps offered by OpenAI.
I've triggered significant productivity advantages by creating these as more formal integrations. Our teams don't want to go somewhere to use AI and then return with a copy buffer; they want it seamlessly integrated into their work. Text Blaze makes this possible as discussed here, and we have copilots running in Espanso, Coda, and Google Apps Script.