Don't know about excel, but for Google Sheets. You can ask chatgpt to write you a appsscript custom function e.g CALL_OPENAI. Then you can pass in variables into. =CALL_OPEN("Classify this survey response as positive, negative, or off-topic: "&A1)
When I tried the Gemini/AI formula it didn’t work very well, gpt-5 mini or nano are cheap and generally do what you want if you are asking something straightforward about a piece of content you give them. You can also give a json schema to make the results more deterministic.
