OpenAI has introduced a new feature that allows customers to fine-tune their GPT-3.5 Turbo model using their own data, resulting in more accurate outcomes. The fine-tuning process enables developers to customize the model's behavior for specific use cases, achieving parity with or surpassing the capabilities of the base GPT-4 model. Businesses have noticed improvements in model performance, including enhanced precision, consistent output formatting, tailored expression, and streamlined prompts.