OpenAPI GPT is a tool designed to aid in the effortless creation of OpenAPI specifications for RESTful APIs. It integrates with ChatGPT in providing a unique conversational interface to create or adjust OpenAPI specifications. Built by the GPT community, it enhances the process of API documentation by automating the generation of OpenAPI specs directly from your website. A key feature of OpenAPI GPT includes offering prompt starters such as 'Create OpenAPI spec for this website:' and 'Fix my OpenAPI spec:', to guide the user in initializing the creation or alteration process. An account is required to access OpenAPI GPT and it also necessitates a subscription to ChatGPT Plus for utilization. In essence, OpenAPI GPT transforms how developers work with RESTful APIs by providing a seamless, user-friendly way to generate OpenAPI specifications, thereby easing the traditionally complicated task of API documentation.