I added chatGPT to Obsidian following these steps to install an experimental plugin. I also set up a pay as you go account for OpenAI as I’ve used up my trial period for both Dall-E and GPT-3.
At first glance using the GPT3 plugin works fine, although what seems to be missing is the actual chat part, the back and forth where you build on a response with further prompts. The power of chatGPT as a tool is in that iterative prompting I think.
You can still iterate by prompting the chatGPT with the entirety of the previous exchange but that is slightly cumbersome (it means you’d go into a note delete the previous exchange, and then have the plugin re-add it plus the next generated part).
I think it will be more fruitful to do the entire exchange with chatGPT in the browser and manually grab the content if I want to use it in Obsidian. The MarkDownload browser extension capably grabs the entire exchange with chatGPT and stores it as markdown in my Obsidian notes as well.