Swagger/OpenAPI specification

Hey. We want to release an SDK for C# and would like to know if you have an official Swagger/OpenAPI spec? I did not find this in the documentation and when searching among the repositories of the organization
I think it would be great if this is available in a separate repository and updated according to the latest changes, like OpenAI - https://github.com/openai/openai-openapi