OpenAI o1 is a series of newly developed AI models designed to tackle complex problems in fields such as science, coding, and mathematics through prolonged contemplation. These models refine their thinking process by learning through training, exploring different strategies, and identifying errors. In qualification rounds of the International Mathematical Olympiad, the o1 model scored significantly higher than the previous GPT-4o model, showcasing its advantages in mathematics and coding. Additionally, the o1 series introduces new safety training methods that enhance its adherence to safety and alignment guidelines.