On September 4, 2024, OpenAI released a new GPT-4o model, which features Structured Outputs and reduced pricing. Microsoft is also offering this new model at the same price, emphasizing benefits such as consistent data formats. OpenAI's guide to model selection highlights that switching from GPT-4o to GPT-4o-mini with fine-tuning can achieve equivalent performance for less than 2% of the cost using only 1,000 labeled examples. The development of AI models by OpenAI demonstrates a balance between scaling and optimization.