"...the actual phrase GPT, standing for generative pre-trained transformer, is a broad term describing the AI technology. The term was first introduced in 2018 in a research paper published by OpenAI, but has since been used to describe any AI model that meet certain criteria.
This broad use could cause problems for OpenAI as the U.S. Patent and Trademark Office says it can refuse to trademark a term that is 'merely descriptive.'"