diff --git a/src/openai/lib/azure.py b/src/openai/lib/azure.py
index ad64707261..7ca3fb844c 100644
--- a/src/openai/lib/azure.py
+++ b/src/openai/lib/azure.py
@@ -61,9 +61,11 @@ def _build_request(
         retries_taken: int = 0,
     ) -> httpx.Request:
         if options.url in _deployments_endpoints and is_mapping(options.json_data):
-            model = options.json_data.get("model")
+            json_data = cast(Mapping[str, Any], options.json_data)
+            model = json_data.get("model")
             if model is not None and "/deployments" not in str(self.base_url.path):
                 options.url = f"/deployments/{model}{options.url}"
+                options.json_data = {k: v for k, v in json_data.items() if k != "model"}
 
         return super()._build_request(options, retries_taken=retries_taken)
 
diff --git a/tests/lib/test_azure.py b/tests/lib/test_azure.py
index 52c24eba27..4bccf285bb 100644
--- a/tests/lib/test_azure.py
+++ b/tests/lib/test_azure.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import json
 import logging
 from typing import Union, cast
 from typing_extensions import Literal, Protocol
@@ -47,6 +48,38 @@ def test_implicit_deployment_path(client: Client) -> None:
     )
 
 
+@pytest.mark.parametrize("client", [sync_client, async_client])
+@pytest.mark.parametrize(
+    "endpoint,model",
+    [
+        ("/chat/completions", "gpt-4o"),
+        ("/completions", "gpt-4o"),
+        ("/embeddings", "text-embedding-ada-002"),
+        ("/images/generations", "gpt-image-1-5"),
+        ("/images/edits", "gpt-image-1-5"),
+        ("/audio/transcriptions", "whisper-1"),
+        ("/audio/translations", "whisper-1"),
+        ("/audio/speech", "tts-1"),
+    ],
+)
+def test_implicit_deployment_strips_model_from_body(client: Client, endpoint: str, model: str) -> None:
+    req = client._build_request(
+        FinalRequestOptions.construct(
+            method="post",
+            url=endpoint,
+            json_data={"model": model, "extra": "value"},
+        )
+    )
+
+    body = json.loads(req.content.decode())
+    assert "model" not in body
+    assert body["extra"] == "value"
+    assert (
+        str(req.url)
+        == f"https://example-resource.azure.openai.com/openai/deployments/{model}{endpoint}?api-version=2023-07-01"
+    )
+
+
 @pytest.mark.parametrize(
     "client,method",
     [