Fix model equality when using runtime extra configuration (#13062)

Viicos · web-flow · commit b1bf19445d8a · 2026-04-10T18:02:28.000Z
diff --git a/pydantic/main.py b/pydantic/main.py
@@ -1171,9 +1171,11 @@ def __eq__(self, other: Any) -> bool:
 
                 # Perform common checks first
                 if not (
-                    self_type == other_type
+                    self_type is other_type
                     and getattr(self, '__pydantic_private__', None) == getattr(other, '__pydantic_private__', None)
-                    and self.__pydantic_extra__ == other.__pydantic_extra__
+                    # We need to assume `None` and `{}` are equivalent, because extra behavior
+                    # can be controlled at validation time:
+                    and (self.__pydantic_extra__ or {}) == (other.__pydantic_extra__ or {})
                 ):
                     return False
 
diff --git a/tests/test_main.py b/tests/test_main.py
@@ -2871,6 +2871,15 @@ class MyModel(BaseModel, extra='allow'):
     assert MyModel(x=1) != MyModel()
 
 
+def test_extra_equality_runtime_override() -> None:
+    """https://github.com/pydantic/pydantic/issues/13051"""
+
+    class MyModel(BaseModel, extra='allow'):
+        a: int
+
+    assert MyModel.model_validate({'a': 1}) == MyModel.model_validate({'a': 1}, extra='forbid')
+
+
 def test_equality_delegation():
     from unittest.mock import ANY
 
