I asked GPT Chat: "what is the probability that this poem was written by openai chat bot" and then included the poem. I have no idea why it starts with a sentence fragment!

"it being written by an OpenAI chat bot would be high. However, if the poem was written by a human who is simply using OpenAI's tools or language models, the probability of it being written by an OpenAI chat bot would be low. Without more context, it is impossible to accurately determine the probability."