By default, objects are unmarshalled to dictionaries. You can use dynamically created dataclasses by providing the x-model property inside the schema definition with the name of the model.

  # ...
  components:
   schemas:
     Coordinates:
       x-model: Coordinates
       type: object
       required:
         - lat
         - lon
       properties:
         lat:
           type: number
         lon:
           type: number

As a result of the unmarshalling process, you will get a Coordinates class instance with lat and lon attributes.

You can use your own dataclasses, pydantic models, or models generated by third-party generators (e.g., datamodel-code-generator) by providing the x-model-path property inside the schema definition with the location of your class.

  # ...
  components:
   schemas:
     Coordinates:
       x-model-path: foo.bar.Coordinates
       type: object
       required:
         - lat
         - lon
       properties:
         lat:
           type: number
         lon:
           type: number

from dataclasses import dataclass

@dataclass
class Coordinates:
    lat: float
    lon: float

As a result of the unmarshalling process, you will get an instance of your own dataclass or model.