Golden Finance reported that in the early morning of the 18th, OpenAI started its ninth day of technology sharing live broadcast, officially released the API of the o1 model, and made a major upgrade to the real-time API to support WebRTC. Among them, the API of the o1 model has reduced the thinking cost by 60% compared with the previous preview version, and comes with advanced visual functions; the audio cost of GPT-4o has been reduced by 60%, and the price of the mini version has dropped by 10 times. At the same time, OpenAI also released a new preference fine-tuning method, which allows large models to better grasp the user's preference style through the direct preference optimization algorithm.