diff --git a/litellm/images/main.py b/litellm/images/main.py
index 6a94e7c8df2..18255e88c24 100644
--- a/litellm/images/main.py
+++ b/litellm/images/main.py
@@ -64,6 +64,9 @@ from litellm.utils import (
 # Cache for ImageEditRequestUtils to avoid repeated __getattr__ calls
 _ImageEditRequestUtils_cache: Optional["ImageEditRequestUtils"] = None
 
+# Kept out of all_litellm_params because that list is stripped before drop_params is applied.
+_IMAGE_EDIT_CONTROL_KWARGS: Final = frozenset(("drop_params", "additional_drop_params"))
+
 
 def _get_ImageEditRequestUtils() -> "ImageEditRequestUtils":
     """Get ImageEditRequestUtils, loading it lazily if needed."""
@@ -759,8 +762,8 @@ def image_edit(
         litellm_params_list: Final = all_litellm_params
         default_params: Final = openai_params + litellm_params_list
         non_default_params: Final = {
-            k: v for k, v in kwargs.items() if k not in default_params
-        }  # model-specific params - pass them straight to the model/provider
+            k: v for k, v in kwargs.items() if k not in default_params and k not in _IMAGE_EDIT_CONTROL_KWARGS
+        }
         litellm_logging_obj: Final[LiteLLMLoggingObj] = kwargs.get("litellm_logging_obj")
         litellm_call_id: Final[str | None] = kwargs.get("litellm_call_id", None)
         model_info: Final = kwargs.get("model_info", None)
diff --git a/tests/test_litellm/images/test_image_edit_extra_params.py b/tests/test_litellm/images/test_image_edit_extra_params.py
index 088faafa9f3..1d1fce2bf63 100644
--- a/tests/test_litellm/images/test_image_edit_extra_params.py
+++ b/tests/test_litellm/images/test_image_edit_extra_params.py
@@ -121,6 +121,35 @@ def test_image_edit_forwards_scalar_array_as_repeated_fields():
     assert b"style_a" in body and b"style_b" in body and b"style_c" in body
 
 
+@pytest.mark.parametrize("drop_params", [True, False])
+def test_image_edit_strips_per_model_drop_params_from_multipart(drop_params):
+    """Per-model drop_params / additional_drop_params are LiteLLM control
+    flags. If they survive into non_default_params they are flattened onto the
+    OpenAI images/edits multipart body and the provider rejects the call with
+    Unknown parameter: 'drop_params'. Issue #40153."""
+    captured = {}
+    client = HTTPHandler(client=httpx.Client(transport=httpx.MockTransport(_capture_image_edit_request(captured))))
+
+    litellm.image_edit(
+        model="openai/gpt-image-1",
+        image=PNG_BYTES,
+        prompt="Make the background blue",
+        api_key="sk-test",
+        api_base="https://edit.example/v1",
+        client=client,
+        seed=42,
+        drop_params=drop_params,
+        additional_drop_params=["quality_level"],
+    )
+
+    fields = _multipart_text_fields(captured["content_type"], captured["body"])
+    assert "drop_params" not in fields
+    assert "additional_drop_params" not in fields
+    assert fields["seed"] == "42"
+    assert fields["prompt"] == "Make the background blue"
+    assert fields["model"] == "gpt-image-1"
+
+
 @pytest.mark.asyncio
 async def test_aimage_edit_forwards_extra_body():
     """aimage_edit used to drop extra_headers/extra_query/extra_body when