diff --git a/langextract/providers/gemini.py b/langextract/providers/gemini.py
index a82afe1e..08b804e4 100644
--- a/langextract/providers/gemini.py
+++ b/langextract/providers/gemini.py
@@ -45,6 +45,7 @@
     'tools',
     'stop_sequences',
     'candidate_count',
+    'thinking_config',
 }
 
 
@@ -125,8 +126,9 @@ def __init__(
         Gemini handles this based on schema).
       **kwargs: Additional Gemini API parameters. Only allowlisted keys are
         forwarded to the API (response_schema, response_mime_type, tools,
-        safety_settings, stop_sequences, candidate_count, system_instruction).
-        See https://ai.google.dev/api/generate-content for details.
+        safety_settings, stop_sequences, candidate_count,
+        system_instruction, thinking_config). See
+        https://ai.google.dev/api/generate-content for details.
     """
     try:
       # pylint: disable=import-outside-toplevel
diff --git a/tests/inference_test.py b/tests/inference_test.py
index 92433b04..045b6f7d 100644
--- a/tests/inference_test.py
+++ b/tests/inference_test.py
@@ -363,6 +363,7 @@ def test_gemini_allowlist_filtering(self, mock_client_class):
         tools=["tool1", "tool2"],
         stop_sequences=["\n\n"],
         system_instruction="Be helpful",
+        thinking_config={"thinking_level": "minimal"},
         # Unknown parameters to test filtering
         unknown_param="should_be_ignored",
         another_unknown="also_ignored",
@@ -372,6 +373,7 @@ def test_gemini_allowlist_filtering(self, mock_client_class):
         "tools": ["tool1", "tool2"],
         "stop_sequences": ["\n\n"],
         "system_instruction": "Be helpful",
+        "thinking_config": {"thinking_level": "minimal"},
     }
     self.assertEqual(
         expected_extra_kwargs,
@@ -386,7 +388,12 @@ def test_gemini_allowlist_filtering(self, mock_client_class):
     call_args = mock_client.models.generate_content.call_args
     config = call_args.kwargs["config"]
 
-    for key in ["tools", "stop_sequences", "system_instruction"]:
+    for key in [
+        "tools",
+        "stop_sequences",
+        "system_instruction",
+        "thinking_config",
+    ]:
       self.assertIn(key, config, f"Expected {key} to be in API config")
       self.assertEqual(
           expected_extra_kwargs[key],
@@ -415,6 +422,7 @@ def test_gemini_runtime_kwargs_filtered(self, mock_client_class):
             prompts,
             candidate_count=2,
             safety_settings={"HARM_CATEGORY_DANGEROUS": "BLOCK_NONE"},
+            thinking_config={"thinking_level": "minimal"},
             unknown_runtime_param="ignored",
         )
     )
@@ -432,6 +440,11 @@ def test_gemini_runtime_kwargs_filtered(self, mock_client_class):
         config.get("safety_settings"),
         "safety_settings should be passed through to API",
     )
+    self.assertEqual(
+        {"thinking_level": "minimal"},
+        config.get("thinking_config"),
+        "thinking_config should be passed through to API",
+    )
     self.assertNotIn(
         "unknown_runtime_param", config, "Unknown kwargs should be filtered out"
     )