Does Perplexity AI use GPT?

Could you please clarify if Perplexity AI incorporates the use of GPT, or Generative Pre-trained Transformer, in its operations? I'm interested in understanding if this advanced language model technology is being Leveraged by the company to enhance its AI capabilities and deliver more sophisticated services. Additionally, if Perplexity AI does utilize GPT, could you elaborate on how it's being integrated into the company's offerings and the potential benefits it brings to its users?