From 9faaf7f4d436b558dbc4d1ab25a5801269629d6d Mon Sep 17 00:00:00 2001
From: yucheng <yucheng@berri.ai>
Date: Wed, 16 Sep 2026 07:15:13 +0000
Subject: [PATCH] refactor(proxy): assign the fallback model on the fresh
 snapshot instead of building a dict literal

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/proxy/common_request_processing.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/litellm/proxy/common_request_processing.py b/litellm/proxy/common_request_processing.py
index 7c9a296965c..d18fab1c9f0 100644
--- a/litellm/proxy/common_request_processing.py
+++ b/litellm/proxy/common_request_processing.py
@@ -2113,7 +2113,8 @@ class ProxyBaseLLMRequestProcessing:
                 for fallback_model in fallback_models:
                     if fallback_model == original_model:
                         continue
-                    self.data = {**independent_snapshot(pristine), "model": fallback_model}
+                    self.data = independent_snapshot(pristine)
+                    self.data["model"] = fallback_model
                     try:
                         return await self.common_processing_pre_call_logic(
                             request=request,