alt Hacker NewsOpenAPI 3.1 replaced the not-a-superset-or-subset of JSON Schema with the actual JSON Schema (latest version) over five years ago. No one should be using 3.0.x anymore. And 3.2 came out a few months ago, containing lots of features that have been in high demand (support for arbitrary HTTP methods, full expression of multipart and streaming messages, etc).
> No one should be using 3.0.x anymore
Many users are stuck at 3.0 or even Swagger 2.0 because the libraries they use refuse to support recent versions. Also OpenAPI is still not a strict superset because things like `discriminator` are still missing in JSON schema.