From 62d8258868b745bfab8f7521ba498ad2a1564b06 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 19 Aug 2026 20:27:50 +0000
Subject: [PATCH 1/2] fix(dashscope): forward reasoning_effort to the provider

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/llms/dashscope/chat/transformation.py     |  6 ++++++
 .../test_dashscope_chat_transformation.py         | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/litellm/llms/dashscope/chat/transformation.py b/litellm/llms/dashscope/chat/transformation.py
index 5ab7fbf3658..977bb38f59a 100644
--- a/litellm/llms/dashscope/chat/transformation.py
+++ b/litellm/llms/dashscope/chat/transformation.py
@@ -12,6 +12,12 @@ from ...openai.chat.gpt_transformation import OpenAIGPTConfig
 
 
 class DashScopeChatConfig(OpenAIGPTConfig):
+    def get_supported_openai_params(self, model: str) -> list:  # mutable-ok: base class contract returns a list
+        return [  # mutable-ok: base class contract returns a list
+            *super().get_supported_openai_params(model=model),
+            "reasoning_effort",
+        ]
+
     def remove_cache_control_flag_from_messages_and_tools(
         self,
         model: str,
diff --git a/tests/test_litellm/llms/dashscope/test_dashscope_chat_transformation.py b/tests/test_litellm/llms/dashscope/test_dashscope_chat_transformation.py
index 8dbc197d4b5..e3bbf2abc48 100644
--- a/tests/test_litellm/llms/dashscope/test_dashscope_chat_transformation.py
+++ b/tests/test_litellm/llms/dashscope/test_dashscope_chat_transformation.py
@@ -169,6 +169,21 @@ class TestDashScopeConfig:
 
         assert transformed_messages[0].get("cache_control") == {"type": "ephemeral"}
 
+    @pytest.mark.parametrize("reasoning_effort", ["none", "minimal", "low", "high"])
+    def test_dashscope_forwards_reasoning_effort(self, reasoning_effort: str):
+        """DashScope supports reasoning_effort, so it must reach the provider instead of being dropped."""
+        assert "reasoning_effort" in DashScopeChatConfig().get_supported_openai_params(
+            model="qwen3.7-plus"
+        )
+
+        optional_params = litellm.get_optional_params(
+            model="qwen3.7-plus",
+            custom_llm_provider="dashscope",
+            reasoning_effort=reasoning_effort,
+        )
+
+        assert optional_params["reasoning_effort"] == reasoning_effort
+
     def test_dashscope_preserves_cache_control_in_tools(self):
         """DashScope should NOT strip cache_control from tools."""
         config = DashScopeChatConfig()

From 2b6c30c2d93199586fd696fab7cedc0c5f769b16 Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Wed, 19 Aug 2026 20:42:38 +0000
Subject: [PATCH 2/2] refactor(dashscope): tighten supported params return type

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
---
 litellm/llms/dashscope/chat/transformation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/litellm/llms/dashscope/chat/transformation.py b/litellm/llms/dashscope/chat/transformation.py
index 977bb38f59a..04d530ea89b 100644
--- a/litellm/llms/dashscope/chat/transformation.py
+++ b/litellm/llms/dashscope/chat/transformation.py
@@ -12,7 +12,7 @@ from ...openai.chat.gpt_transformation import OpenAIGPTConfig
 
 
 class DashScopeChatConfig(OpenAIGPTConfig):
-    def get_supported_openai_params(self, model: str) -> list:  # mutable-ok: base class contract returns a list
+    def get_supported_openai_params(self, model: str) -> list[str]:  # mutable-ok: base class contract returns a list
         return [  # mutable-ok: base class contract returns a list
             *super().get_supported_openai_params(model=model),
             "reasoning_effort",