I've been playing a lot with the OpenAI API. I recorded this little video walking through using the completions endpoint to summarize a blog post: https://www.youtube.com/watch?v=VV6fPf6O3sY&lc=Ugyf3wIf7ybMltwSfmV4AaABAg
Recursively summarize blog posts with OpenAI and Ruby on Rails

YouTube