diff --git a/models.py b/models.py
new file mode 100644
index 0000000..ce31de1
--- /dev/null
+++ b/models.py
@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import Annotated, Literal, Union
+
+from pydantic import BaseModel, Field
+
+
+class HttpOkEvent(BaseModel):
+    kind: Literal["ok"] = Field("ok", description="Discriminator for OK events")
+    status: Literal[200] = Field(200, description="HTTP status code for success")
+    path: str = Field(..., description="Requested path")
+    duration_ms: int = Field(..., description="Duration of the request in milliseconds")
+
+
+class HttpErrorEvent(BaseModel):
+    kind: Literal["error"] = Field("error", description="Discriminator for error events")
+    status: int = Field(..., description="HTTP status code for error (4xx/5xx)")
+    path: str = Field(..., description="Requested path")
+    error_message: str = Field(..., description="Error message returned by the server")
+
+
+ApiEvent = Annotated[
+    Union[HttpOkEvent, HttpErrorEvent],
+    Field(discriminator="kind")
+]
+
+__all__ = ["HttpOkEvent", "HttpErrorEvent", "ApiEvent"]