OpenAI has significantly advanced artificial intelligence by developing powerful language models like the Generative Pre-trained Transformer (GPT) series. These models, starting from GPT-1 to the groundbreaking GPT-4o, have evolved through improvements in efficiency, scalability, and multimodal capabilities integrating text, vision, and audio. GPT-4o marks a transformative milestone with its ability to handle complex data across over 50 languages, offering real-time interactions and sentiment analysis. OpenAI also introduced the cost-effective GPT-4o Mini. Despite its innovations, GPT-4o faces challenges such as context window limitations, potential bias, and security vulnerabilities, all necessitating ongoing advancements and dual-track model development strategies.