Possible to build a product description generator with gpt-3.5-turbo?

Yes, it’s definitely possible to that @op

You should read chat completionn docs

Keep in mind:

text-davinci-003 and chatGPT are different models, the key difference being that the text-davinci-003 series models are trained for completions while the gpt-3.5-turbo models are trained for conversation(chat completions), this means that the prompts for the models will be different for the same task. You prompt will have to be in chat form.