GPTGenerative Pre-trained Transformer — OpenAI's family of large language models from GPT-1 through GPT-5.-4o ('o' for omni) unified text, image, and voice in a single endpoint — powering ChatGPTOpenAI's conversational chat product — brought large language models to hundreds of millions of users.'s voice mode and real-time translation demos. It matched GPTGenerative Pre-trained Transformer — OpenAI's family of large language models from GPT-1 through GPT-5.-4 Turbo quality at half the latency, resetting expectations for interactive AI apps.

GPTGenerative Pre-trained Transformer — OpenAI's family of large language models from GPT-1 through GPT-5.-4o made multimodalAI models that process multiple input types — text, images, audio, and video in one system., low-latency AI the default consumer experience.

Native audio and vision in one model simplified product architecture for AI apps.