GPT API Schema Builder is a GPT developed to help create OpenAPI schemas from API documentation. This GPT works by taking in API documentation data, processing it, and generating an OpenAPI schema from it. The OpenAPI schemas play a critical role in modern software development, allowing developers to codify their API's details in a format that is both language-agnostic and easily understood. By converting documentation into these schemas, the GPT API Schema Builder eases the process of working with APIs, enhancing interoperability and reducing errors that may arise due to misunderstanding or misinterpretation of the API's functionality. Typically, it employs prompt starters such as 'Turn this cURL command into an OpenAPI schema.' or 'How does this API documentation translate to a schema?'. This allows it to interface with the user in a conversational manner, making it easier to use. It must be noted that it requires ChatGPT Plus, implying that it operates by leveraging the advanced capabilities of ChatGPT. By creating an automated way to develop OpenAPI schemas, the GPT API Schema Builder helps shorten the development cycle, reduce manhours required for documentation, and makes the process of understanding and working with APIs more straightforward. The GPT API Schema Builder is thus an essential tool for developers and teams working extensively with APIs and seeking to streamline their processes through automation. This tool aims to make API integration faster, more efficient, and less error-prone, as well as making the API documentation more accessible and understandable by converting it into OpenAPI schemas.