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Swagger and OpenAPI are the same thing. They made a confusing name change somewhere between 2 and 3.

(Swagger = trademark owned by SmartBear, OpenAPI = new name, run by Linux Foundation)

You are correct that the Swagger name is owned by Smartbear, however, whereas previously Swagger was used to name tooling and the specification, now Swagger only refers to the tooling built by Smartbear. OpenAPI V2 and V3 is the name of just the specification. Saying that they are the same thing causes more confusion than has already been created.

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