diff --git a/litellm/llms/baseten/chat.py b/litellm/llms/baseten/chat.py
index 0374646f2f3..e92f47c41c0 100644
--- a/litellm/llms/baseten/chat.py
+++ b/litellm/llms/baseten/chat.py
@@ -54,6 +54,7 @@ class BasetenConfig(OpenAIGPTConfig):
         return [
             "max_tokens",
             "max_completion_tokens",
+            "reasoning_effort",
             "response_format",
             "seed",
             "stop",
diff --git a/tests/unit/llms/baseten/chat/test_baseten_completions.py b/tests/unit/llms/baseten/chat/test_baseten_completions.py
index caf96987933..9195df13242 100644
--- a/tests/unit/llms/baseten/chat/test_baseten_completions.py
+++ b/tests/unit/llms/baseten/chat/test_baseten_completions.py
@@ -18,10 +18,7 @@ class TestBasetenRouting:
         )
 
         # Model API (non-8-character)
-        assert (
-            config.get_api_base_for_model("openai/gpt-oss-120b")
-            == "https://inference.baseten.co/v1"
-        )
+        assert config.get_api_base_for_model("openai/gpt-oss-120b") == "https://inference.baseten.co/v1"
 
 
 class TestBasetenModelAPI:
@@ -47,12 +44,37 @@ class TestBasetenModelAPI:
         assert result["top_p"] == 0.9
 
         # Test provider info
-        api_base, api_key = config._get_openai_compatible_provider_info(
-            None, "test-key"
-        )
+        api_base, api_key = config._get_openai_compatible_provider_info(None, "test-key")
         assert api_base == "https://inference.baseten.co/v1"
         assert api_key == "test-key"
 
 
+class TestBasetenReasoningEffort:
+    def test_reasoning_effort_passthrough_with_drop_params(self):
+        config = BasetenConfig()
+
+        result = config.map_openai_params(
+            non_default_params={"reasoning_effort": "high", "max_tokens": 100},
+            optional_params={},
+            model="deepseek-ai/DeepSeek-V4-Flash-0731",
+            drop_params=True,
+        )
+
+        assert result["reasoning_effort"] == "high"
+        assert result["max_tokens"] == 100
+
+    def test_reasoning_effort_none_passthrough(self):
+        config = BasetenConfig()
+
+        result = config.map_openai_params(
+            non_default_params={"reasoning_effort": "none"},
+            optional_params={},
+            model="moonshotai/Kimi-K3",
+            drop_params=True,
+        )
+
+        assert result["reasoning_effort"] == "none"
+
+
 if __name__ == "__main__":
     pytest.main([__file__])