【OpenAI Opens Full Blood o1 Model API, Costs Reduced by 60%】Golden Finance reported that in the early hours of the 18th, OpenAI launched the 9th day of its technical sharing live stream, officially releasing the o1 model API and making a major upgrade to the real-time API to support WebRTC. Among them, the o1 model API has reduced thinking costs by 60% compared to the previous preview version and comes with advanced visual features; the audio cost of GPT-4o has decreased by 60%, while the price of the mini version has plummeted by 10 times. At the same time, OpenAI also released a brand new preference fine-tuning method, which allows large models to better grasp users' preferred styles through direct preference optimization algorithms.