From 9de0fcea93078ee13b88c8a686392a932851ecda Mon Sep 17 00:00:00 2001
From: Cursor Agent <cursoragent@cursor.com>
Date: Mon, 18 May 2026 13:30:58 +0000
Subject: [PATCH] fix: address bug detection findings (cache token order,
 mutable defaults)

Co-authored-by: Yassin Kortam <yassin@berri.ai>
---
 litellm/cost_calculator.py                      | 8 ++++----
 litellm/llms/dashscope/rerank/transformation.py | 9 ++++++---
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/litellm/cost_calculator.py b/litellm/cost_calculator.py
index da72eb9bb69..b05cd01af2c 100644
--- a/litellm/cost_calculator.py
+++ b/litellm/cost_calculator.py
@@ -365,11 +365,11 @@ def cost_per_token(  # noqa: PLR0915
         if _pt_details is not None:
             _cache_read_tokens = float(getattr(_pt_details, "cached_tokens", 0) or 0)
             # OpenAI-compatible providers report cache-write tokens under
-            # either `cache_creation_tokens` or `cache_write_tokens` (kimi-k2
-            # uses the latter). Mirror db_spend_update_writer to stay symmetric.
+            # either `cache_write_tokens` (kimi-k2) or `cache_creation_tokens`.
+            # Mirror db_spend_update_writer to stay symmetric.
             _cache_creation_tokens = float(
-                getattr(_pt_details, "cache_creation_tokens", 0)
-                or getattr(_pt_details, "cache_write_tokens", 0)
+                getattr(_pt_details, "cache_write_tokens", 0)
+                or getattr(_pt_details, "cache_creation_tokens", 0)
                 or 0
             )
 
diff --git a/litellm/llms/dashscope/rerank/transformation.py b/litellm/llms/dashscope/rerank/transformation.py
index faa1688b5a1..629f3cf4af7 100644
--- a/litellm/llms/dashscope/rerank/transformation.py
+++ b/litellm/llms/dashscope/rerank/transformation.py
@@ -159,10 +159,13 @@ class DashScopeRerankConfig(BaseRerankConfig):
         model_response: RerankResponse,
         logging_obj: LiteLLMLoggingObj,
         api_key: Optional[str] = None,
-        request_data: dict = {},
-        optional_params: dict = {},
-        litellm_params: dict = {},
+        request_data: Optional[dict] = None,
+        optional_params: Optional[dict] = None,
+        litellm_params: Optional[dict] = None,
     ) -> RerankResponse:
+        request_data = request_data or {}
+        optional_params = optional_params or {}
+        litellm_params = litellm_params or {}
         try:
             response_json = raw_response.json()
         except Exception: