The parameters in the OpenAI playground have always been a bit of a mystery to me. I wasn't sure when to turn on the frequency penalty, decrease the "top P", or use the "best of" parameter that triples the cost.
This tool lets you experiment with the impact of various GPT-3 parameters on the generated results. This should help you get a better understanding of how to adjust the parameters for your specific needs.
I've pre-calculated completions across different parameters using four different tasks: generating startup ideas, copywriting, summarization, and brainstorming. For each set of parameters, I've generated five different completions to give you an idea of the variety of possible outcomes.
[Edited: tool is currently disabled, since it got out-of-sync pretty quickly.]