diff --git a/src/kaggle_benchmarks/messages.py b/src/kaggle_benchmarks/messages.py
index fcacc88..5446dda 100644
--- a/src/kaggle_benchmarks/messages.py
+++ b/src/kaggle_benchmarks/messages.py
@@ -17,6 +17,8 @@
 import warnings
 from typing import TYPE_CHECKING, Any, Generic, Iterable, TypeVar
 
+import pydantic
+
 from kaggle_benchmarks import events, utils
 
 if TYPE_CHECKING:
@@ -75,6 +77,8 @@ def usage(self):
     def payload(self) -> str | list[dict]:
         if hasattr(self.content, "get_payload"):
             return self.content.get_payload()
+        if isinstance(self.content, pydantic.BaseModel):
+            return self.content.model_dump_json()
         if dataclasses.is_dataclass(self.content) and not isinstance(
             self.content, type
         ):
diff --git a/tests/test_messages.py b/tests/test_messages.py
index e5ce409..3e836d7 100644
--- a/tests/test_messages.py
+++ b/tests/test_messages.py
@@ -15,6 +15,7 @@
 import json
 from dataclasses import dataclass
 
+import pydantic
 import pytest
 
 from kaggle_benchmarks import actors, chats, messages, user
@@ -54,6 +55,15 @@ class Point:
     assert json.loads(msg.payload) == {"x": 1, "y": 2}
 
 
+def test_pydantic_payload():
+    class Point(pydantic.BaseModel):
+        x: float
+        y: float
+
+    msg = messages.Message(Point(x=1.5, y=2.5), sender=user)
+    assert json.loads(msg.payload) == {"x": 1.5, "y": 2.5}
+
+
 def test_class_payload():
     class Point:
         def __init__(self, x):