diff --git a/enterprise/litellm_enterprise/proxy/hooks/managed_files.py b/enterprise/litellm_enterprise/proxy/hooks/managed_files.py
index ec47b6ac0e6..5fe7b38c06a 100644
--- a/enterprise/litellm_enterprise/proxy/hooks/managed_files.py
+++ b/enterprise/litellm_enterprise/proxy/hooks/managed_files.py
@@ -4,7 +4,8 @@
 import base64
 import json
 from types import MappingProxyType
-from typing import TYPE_CHECKING, Any, Dict, List, Literal, Optional, Union, cast
+from typing import TYPE_CHECKING, Any, Dict, Final, List, Literal, Optional, Union, cast
+from uuid import NAMESPACE_URL, uuid5
 
 from fastapi import HTTPException
 
@@ -1059,10 +1060,13 @@ class _PROXY_LiteLLMManagedFiles(CustomLogger, BaseFileEndpoints):
     def get_unified_output_file_id(
         self, output_file_id: str, model_id: str, model_name: Optional[str]
     ) -> str:
+        deterministic_uuid: Final = uuid5(
+            uuid5(NAMESPACE_URL, model_id), output_file_id
+        )
         unified_output_file_id = (
             SpecialEnums.LITELLM_MANAGED_FILE_COMPLETE_STR.value.format(
                 "application/json",
-                str(uuid.uuid4()),
+                str(deterministic_uuid),
                 model_name or "",
                 output_file_id,
                 model_id,
diff --git a/tests/test_litellm/enterprise/proxy/test_managed_files_hook.py b/tests/test_litellm/enterprise/proxy/test_managed_files_hook.py
index 4a4aa7aa5ea..2a1b6ee222e 100644
--- a/tests/test_litellm/enterprise/proxy/test_managed_files_hook.py
+++ b/tests/test_litellm/enterprise/proxy/test_managed_files_hook.py
@@ -5,6 +5,7 @@ Regression test for afile_retrieve called without credentials in
 async_post_call_success_hook when processing completed batch responses.
 """
 
+import asyncio
 import json
 
 import pytest
@@ -460,3 +461,64 @@ async def test_store_unified_file_id_is_idempotent_via_upsert():
         assert upsert_data["create"]["unified_file_id"] == file_id
         assert json.loads(upsert_data["create"]["model_mappings"]) == model_mappings
         assert json.loads(upsert_data["update"]["model_mappings"]) == model_mappings
+
+
+def test_get_unified_output_file_id_is_deterministic_per_output_file():
+    managed_files, _ = _make_real_managed_files_instance()
+
+    first = managed_files.get_unified_output_file_id(
+        output_file_id="file-output-abc",
+        model_id="model-deploy-xyz",
+        model_name="azure/gpt-4",
+    )
+    repeat = managed_files.get_unified_output_file_id(
+        output_file_id="file-output-abc",
+        model_id="model-deploy-xyz",
+        model_name="azure/gpt-4",
+    )
+    other_file = managed_files.get_unified_output_file_id(
+        output_file_id="file-output-def",
+        model_id="model-deploy-xyz",
+        model_name="azure/gpt-4",
+    )
+    other_model = managed_files.get_unified_output_file_id(
+        output_file_id="file-output-abc",
+        model_id="model-deploy-other",
+        model_name="azure/gpt-4",
+    )
+
+    assert first == repeat
+    assert len({first, other_file, other_model}) == 3
+
+
+@pytest.mark.asyncio
+async def test_concurrent_first_registrations_converge_on_one_row():
+    managed_files, mock_prisma = _make_real_managed_files_instance()
+
+    minted_ids = tuple(
+        managed_files.get_unified_output_file_id(
+            output_file_id="file-output-abc",
+            model_id="model-deploy-xyz",
+            model_name=None,
+        )
+        for _ in range(2)
+    )
+    await asyncio.gather(
+        *(
+            managed_files.store_unified_file_id(
+                file_id=unified_id,
+                file_object=None,
+                litellm_parent_otel_span=None,
+                model_mappings={"model-deploy-xyz": "file-output-abc"},
+                user_api_key_dict=_make_user_api_key_dict(),
+            )
+            for unified_id in minted_ids
+        )
+    )
+
+    upserted_row_keys = {
+        upsert_call.kwargs["where"]["unified_file_id"]
+        for upsert_call in mock_prisma.db.litellm_managedfiletable.upsert.await_args_list
+    }
+    assert minted_ids[0] == minted_ids[1]
+    assert upserted_row_keys == {minted_ids[0]}