OpenAI's structured output feature aims to ensure that the outputs generated by the model strictly adhere to the JSON format provided by developers, enhancing output reliability. This feature first appeared at last year's Developer Day, improving the reliability of the model's ability to generate valid JSON outputs through the JSON format, but it did not ensure that the model responses conformed to a specific pattern. The new feature addresses this issue by constraining the model to match the patterns provided by developers, making it especially suitable for applications that convert unstructured input into structured data. Complex JSON