…As of yesterday, OpenAI has also released the API to call the model that powers ChatGPT.
You can very easily adapt the workflow that we created by doing minimal adjustments in the body request and JSON parsing. You also need to chance the URL in the POST Request to: https://api.openai.com/v1/chat/completions (you can find more details on OpenAI API doc).
The “Select Model” component in the workflow already allows you to select the latest models (the gpt-3.5-turbo family) without any workflow edits. 
Happy KNIMEing!
Roberto