OpenAPI 3 support in Django Rest Framework is still a work in progress. Things are moving quickly so there's not a lot of up to date info about this topic. It's not clear which features of OpenAPI 3 spec are supported in DRF and researching this info on your own

There are two ways to generate an OpenAPI spec in Django Rest Framework: CLI command and API endpoint. How it worksThe actual spec is produced by an underlying generator class, called by either a CLI command or an API endpoint. Long story short: generator collects the project endpoints from settings.