diff --git a/litellm/utils.py b/litellm/utils.py
index 54de4ebbbb2..95acebc4c0a 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -4707,7 +4707,7 @@ def get_optional_params_image_gen(
 
     custom_handler: Final = (
         ProviderConfigManager.get_custom_llm_handler(custom_llm_provider)
-        if custom_llm_provider not in LlmProvidersSet
+        if custom_llm_provider not in ("bedrock", "vertex_ai", "azure_ai", "black_forest_labs", "litellm_proxy")
         else None
     )
     if provider_config is not None:
diff --git a/tests/unit/images/test_main.py b/tests/unit/images/test_main.py
index 79678e3fe43..86f426834d0 100644
--- a/tests/unit/images/test_main.py
+++ b/tests/unit/images/test_main.py
@@ -792,3 +792,22 @@ async def test_custom_images_map_handler_errors_after_forwarding_params(
         with pytest.raises(litellm.RateLimitError, match="image quota exhausted"):
             call(**request, **({"image": b"input-image"} if operation == "edit" else {}))
     assert custom_image_params_handler.requests[0]["user"] == "reject"
+
+
+@pytest.mark.parametrize("is_async", [False, True])
+@pytest.mark.parametrize("with_params", [False, True])
+@pytest.mark.asyncio
+async def test_custom_images_receive_params_for_builtin_names_without_image_support(
+    custom_image_params_handler: CustomImageParamsLLM, monkeypatch: pytest.MonkeyPatch,
+    is_async: bool, with_params: bool,
+) -> None:
+    monkeypatch.setattr(
+        litellm, "custom_provider_map", [{"provider": "anthropic", "custom_handler": custom_image_params_handler}]
+    )
+    litellm.utils.custom_llm_setup()
+    supplied: Final = {"n": 2, "size": "1024x1024"} if with_params else {}
+    request: Final = dict(model="anthropic/custom-image-model", prompt="draw", **supplied)
+    result: Final = await litellm.aimage_generation(**request) if is_async else litellm.image_generation(**request)
+    received: Final = custom_image_params_handler.requests[0]
+    assert {key: received[key] for key in ("n", "size") if key in received} == supplied
+    assert result.data[0].b64_json == "aW1hZ2U="
diff --git a/tests/unit/test_utils_get_optional_params.py b/tests/unit/test_utils_get_optional_params.py
index dd16f2f3ef6..7edffc7972e 100644
--- a/tests/unit/test_utils_get_optional_params.py
+++ b/tests/unit/test_utils_get_optional_params.py
@@ -542,7 +542,9 @@ def test_get_optional_params_image_gen():
 
 
 @pytest.mark.parametrize("with_params", [False, True])
-def test_image_params_keep_builtin_mapping_when_custom_name_collides(monkeypatch, with_params):
+def test_image_params_keep_builtin_mapping_when_custom_name_collides(
+    monkeypatch: pytest.MonkeyPatch, with_params: bool
+) -> None:
     monkeypatch.setattr(litellm, "custom_provider_map", [{"provider": "aiml", "custom_handler": CustomLLM()}])
     supplied: Final = {"n": 2, "size": "1024x1024"} if with_params else {}
     result: Final = get_optional_params_image_gen(
@@ -551,7 +553,7 @@ def test_image_params_keep_builtin_mapping_when_custom_name_collides(monkeypatch
     assert result == ({"num_images": 2, "image_size": {"width": 1024, "height": 1024}} if with_params else {})
 
 
-def test_image_params_keep_builtin_validation_when_custom_name_collides(monkeypatch):
+def test_image_params_keep_builtin_validation_when_custom_name_collides(monkeypatch: pytest.MonkeyPatch) -> None:
     monkeypatch.setattr(litellm, "custom_provider_map", [{"provider": "aiml", "custom_handler": CustomLLM()}])
     with pytest.raises(litellm.UnsupportedParamsError, match="quality"):
         get_optional_params_image_gen(