Who is OpenAI's biggest competitor?

In the realm of artificial intelligence and machine learning, OpenAI has certainly made significant strides. However, given the rapidly evolving nature of this field, it begs the question: Who stands as OpenAI's biggest competitor? Is it another tech giant like Google DeepMind, renowned for their groundbreaking work in reinforcement learning? Or perhaps it's Facebook's AI Research Lab, leveraging the vast amounts of user data to further their AI ambitions? Could it be a startup with a unique approach, such as a company focused on natural language processing? As we delve deeper into this inquiry, it's crucial to understand the nuances of each contender's strengths and weaknesses, as well as how they are positioning themselves against the trailblazing OpenAI.