diff --git a/litellm/llms/bedrock/chat/converse_transformation.py b/litellm/llms/bedrock/chat/converse_transformation.py
index a4d37810f82..254639b2f2e 100644
--- a/litellm/llms/bedrock/chat/converse_transformation.py
+++ b/litellm/llms/bedrock/chat/converse_transformation.py
@@ -930,9 +930,20 @@ class AmazonConverseConfig(BaseConfig):
                         litellm.verbose_logger.warning(DROP_UNSUPPORTED_ADAPTIVE_THINKING_WARNING, model)
                 else:
                     optional_params["thinking"] = value
-            elif param == "reasoning_effort" and isinstance(value, str):
+            elif param == "reasoning_effort" and value is not None:
+                # Accept both string ("low") and dict ({"effort": "low",
+                # "summary": "concise"}). The Responses->Chat parser keeps the
+                # full dict when `summary` is set (see #25359 / #28196), so a
+                # dict here is the standard shape Otto/OpenAI-Responses-Bridge
+                # callers send. Same coercion the direct Anthropic path already
+                # implements.
+                effort_value = value.get("effort") if isinstance(value, dict) else value
+                if not isinstance(effort_value, str):
+                    continue
                 self._handle_reasoning_effort_parameter(
-                    model=model, reasoning_effort=value, optional_params=optional_params
+                    model=model,
+                    reasoning_effort=effort_value,
+                    optional_params=optional_params,
                 )
             elif param == "output_config" and isinstance(value, dict):
                 mapped_output_config = dict(value)
diff --git a/tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py b/tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py
index c5ab6027f45..930941147e7 100644
--- a/tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py
+++ b/tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py
@@ -29,16 +29,11 @@ def test_transform_usage():
     openai_usage = config.transform_usage(usage)
     assert (
         openai_usage.prompt_tokens
-        == usage["inputTokens"]
-        + usage["cacheReadInputTokens"]
-        + usage["cacheWriteInputTokens"]
+        == usage["inputTokens"] + usage["cacheReadInputTokens"] + usage["cacheWriteInputTokens"]
     )
     assert openai_usage.completion_tokens == usage["outputTokens"]
     assert openai_usage.total_tokens == usage["totalTokens"]
-    assert (
-        openai_usage.prompt_tokens_details.cached_tokens
-        == usage["cacheReadInputTokens"]
-    )
+    assert openai_usage.prompt_tokens_details.cached_tokens == usage["cacheReadInputTokens"]
     assert openai_usage._cache_creation_input_tokens == usage["cacheWriteInputTokens"]
     assert openai_usage._cache_read_input_tokens == usage["cacheReadInputTokens"]
     # completion_tokens_details should always be populated
@@ -192,14 +187,10 @@ def test_apply_tool_call_transformation_if_needed():
         role="user",
         content=json.dumps(tool_response),
     )
-    transformed_message, _ = config.apply_tool_call_transformation_if_needed(
-        message, tool_calls
-    )
+    transformed_message, _ = config.apply_tool_call_transformation_if_needed(message, tool_calls)
     assert len(transformed_message.tool_calls) == 1
     assert transformed_message.tool_calls[0].function.name == "test_function"
-    assert transformed_message.tool_calls[0].function.arguments == json.dumps(
-        tool_response["parameters"]
-    )
+    assert transformed_message.tool_calls[0].function.arguments == json.dumps(tool_response["parameters"])
 
 
 def test_transform_tool_call_with_cache_control():
@@ -248,12 +239,7 @@ def test_transform_tool_call_with_cache_control():
     print(function_out_msg)
     assert function_out_msg["toolSpec"]["name"] == "get_location"
     assert function_out_msg["toolSpec"]["description"] == "Get the user's location"
-    assert (
-        function_out_msg["toolSpec"]["inputSchema"]["json"]["properties"]["location"][
-            "type"
-        ]
-        == "string"
-    )
+    assert function_out_msg["toolSpec"]["inputSchema"]["json"]["properties"]["location"]["type"] == "string"
 
     transformed_cache_msg = result["toolConfig"]["tools"][1]
     assert "cachePoint" in transformed_cache_msg
@@ -385,9 +371,7 @@ def test_reasoning_effort_none_omits_thinking_for_anthropic_converse(model):
         ("bedrock/converse/us.anthropic.claude-sonnet-4-6", "minimal", "low"),
     ],
 )
-def test_reasoning_effort_sets_output_config_for_adaptive_models_converse(
-    model, effort, expected_effort
-):
+def test_reasoning_effort_sets_output_config_for_adaptive_models_converse(model, effort, expected_effort):
     """Adaptive Claude 4.6 / 4.7 on Bedrock Converse routes the tier via ``output_config.effort``."""
     config = AmazonConverseConfig()
 
@@ -615,9 +599,7 @@ def test_output_config_format_translated_to_native_output_config_converse():
     assert additional.get("output_config") == {"effort": "xhigh"}
     assert "format" not in additional["output_config"]
     assert result["outputConfig"]["textFormat"]["type"] == "json_schema"
-    parsed_schema = json.loads(
-        result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["schema"]
-    )
+    parsed_schema = json.loads(result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["schema"])
     assert parsed_schema == {**schema, "additionalProperties": False}
 
 
@@ -653,10 +635,7 @@ def test_output_config_format_dropped_on_unsupported_converse_model_warns(caplog
             )
 
     assert "outputConfig" not in result
-    assert any(
-        "dropping `output_config.format`" in record.getMessage()
-        for record in caplog.records
-    )
+    assert any("dropping `output_config.format`" in record.getMessage() for record in caplog.records)
 
 
 def test_output_config_normalized_marker_does_not_leak_into_optional_params():
@@ -692,9 +671,7 @@ def test_output_config_normalized_marker_does_not_leak_into_optional_params():
         ("bedrock/converse/us.anthropic.claude-opus-4-7", "xhigh"),
     ],
 )
-def test_output_config_effort_normalized_for_bedrock_converse_opus(
-    model, expected_effort
-):
+def test_output_config_effort_normalized_for_bedrock_converse_opus(model, expected_effort):
     """Bedrock Converse accepts ``xhigh`` and forwards the provider-safe effort."""
     config = AmazonConverseConfig()
 
@@ -782,17 +759,13 @@ def test_get_supported_openai_params_bedrock_converse():
     for model in litellm.BEDROCK_CONVERSE_MODELS:
         print(f"Testing model: {model}")
         config = AmazonConverseConfig()
-        supported_params_without_prefix = config.get_supported_openai_params(
-            model=model
-        )
+        supported_params_without_prefix = config.get_supported_openai_params(model=model)
 
-        supported_params_with_prefix = config.get_supported_openai_params(
-            model=f"bedrock/converse/{model}"
-        )
+        supported_params_with_prefix = config.get_supported_openai_params(model=f"bedrock/converse/{model}")
 
-        assert set(supported_params_without_prefix) == set(
-            supported_params_with_prefix
-        ), f"Supported params mismatch for model: {model}. Without prefix: {supported_params_without_prefix}, With prefix: {supported_params_with_prefix}"
+        assert set(supported_params_without_prefix) == set(supported_params_with_prefix), (
+            f"Supported params mismatch for model: {model}. Without prefix: {supported_params_without_prefix}, With prefix: {supported_params_with_prefix}"
+        )
         print(f"✅ Passed for model: {model}")
 
 
@@ -1200,9 +1173,7 @@ def test_transform_response_with_structured_response_calling_tool():
         "output": {
             "message": {
                 "content": [
-                    {
-                        "text": "I'll check the current weather in San Francisco for you."
-                    },
+                    {"text": "I'll check the current weather in San Francisco for you."},
                     {
                         "toolUse": {
                             "input": {
@@ -1712,9 +1683,7 @@ def test_transform_request_with_function_tool():
         }
     ]
 
-    messages = [
-        {"role": "user", "content": "What's the weather like in San Francisco?"}
-    ]
+    messages = [{"role": "user", "content": "What's the weather like in San Francisco?"}]
 
     # Transform request
     request_data = config.transform_request(
@@ -1822,22 +1791,18 @@ async def test_assistant_message_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -1883,12 +1848,10 @@ async def test_assistant_message_list_content_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -1941,12 +1904,10 @@ async def test_tool_message_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -1960,10 +1921,7 @@ async def test_tool_message_cache_control():
 
     # First should be tool result
     assert "toolResult" in tool_message_content[0]
-    assert (
-        tool_message_content[0]["toolResult"]["content"][0]["text"]
-        == "Weather data: sunny, 25°C"
-    )
+    assert tool_message_content[0]["toolResult"]["content"][0]["text"] == "Weather data: sunny, 25°C"
 
     # Second should be cachePoint
     assert "cachePoint" in tool_message_content[1]
@@ -2005,12 +1963,10 @@ async def test_tool_message_string_content_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -2021,10 +1977,7 @@ async def test_tool_message_string_content_cache_control():
 
     # First should be tool result
     assert "toolResult" in tool_message_content[0]
-    assert (
-        tool_message_content[0]["toolResult"]["content"][0]["text"]
-        == "Weather: sunny, 25°C"
-    )
+    assert tool_message_content[0]["toolResult"]["content"][0]["text"] == "Weather: sunny, 25°C"
 
     # Second should be cachePoint
     assert "cachePoint" in tool_message_content[1]
@@ -2064,9 +2017,7 @@ async def test_tool_message_search_results_maps_to_bedrock_search_result_block()
                     "source": "Great Source of Information About Apptio",
                     "title": "12adbd74-46bd-4a88-88b2-0048755f6eb5",
                     "content": [
-                        {
-                            "text": "Apptio is a company that makes calls to Bedrock using passthrough APIs via LiteLLM"
-                        }
+                        {"text": "Apptio is a company that makes calls to Bedrock using passthrough APIs via LiteLLM"}
                     ],
                     "citations": {"enabled": True},
                 }
@@ -2079,12 +2030,10 @@ async def test_tool_message_search_results_maps_to_bedrock_search_result_block()
         model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
         llm_provider="bedrock_converse",
     )
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
     assert result == async_result
 
@@ -2093,10 +2042,7 @@ async def test_tool_message_search_results_maps_to_bedrock_search_result_block()
     assert tool_result["status"] == "success"
     assert len(tool_result["content"]) == 1
     assert "searchResult" in tool_result["content"][0]
-    assert (
-        tool_result["content"][0]["searchResult"]["title"]
-        == "12adbd74-46bd-4a88-88b2-0048755f6eb5"
-    )
+    assert tool_result["content"][0]["searchResult"]["title"] == "12adbd74-46bd-4a88-88b2-0048755f6eb5"
 
 
 @pytest.mark.asyncio
@@ -2133,12 +2079,10 @@ async def test_tool_message_empty_search_results_falls_back_to_content():
         model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
         llm_provider="bedrock_converse",
     )
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
     assert result == async_result
 
@@ -2300,12 +2244,10 @@ async def test_assistant_tool_calls_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -2360,12 +2302,10 @@ async def test_multiple_tool_calls_with_mixed_cache_control():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -2411,12 +2351,10 @@ async def test_no_cache_control_no_cache_point():
         llm_provider="bedrock_converse",
     )
 
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -2586,10 +2524,7 @@ def test_guarded_text_with_mixed_content_types():
 
     # Third should be guardContent
     assert "guardContent" in content[2]
-    assert (
-        content[2]["guardContent"]["text"]["text"]
-        == "This sensitive content should be guarded"
-    )
+    assert content[2]["guardContent"]["text"]["text"] == "This sensitive content should be guarded"
 
 
 @pytest.mark.asyncio
@@ -2684,10 +2619,7 @@ def test_guarded_text_with_tool_calls():
 
     # Second should be guardContent
     assert "guardContent" in content[1]
-    assert (
-        content[1]["guardContent"]["text"]["text"]
-        == "Please be careful with sensitive information"
-    )
+    assert content[1]["guardContent"]["text"]["text"] == "Please be careful with sensitive information"
 
     # Other messages should not have guardContent
     for i in range(1, 3):
@@ -2732,10 +2664,7 @@ def test_guarded_text_guardrail_config_preserved():
     # GuardrailConfig should also be in inferenceConfig
     assert "inferenceConfig" in result
     assert "guardrailConfig" in result["inferenceConfig"]
-    assert (
-        result["inferenceConfig"]["guardrailConfig"]["guardrailIdentifier"]
-        == "gr-abc123"
-    )
+    assert result["inferenceConfig"]["guardrailConfig"]["guardrailIdentifier"] == "gr-abc123"
 
 
 def test_auto_convert_last_user_message_to_guarded_text():
@@ -2754,52 +2683,36 @@ def test_auto_convert_last_user_message_to_guarded_text():
         }
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion
     assert len(converted_messages) == 1
     assert converted_messages[0]["role"] == "user"
     assert len(converted_messages[0]["content"]) == 1
     assert converted_messages[0]["content"][0]["type"] == "guarded_text"
-    assert (
-        converted_messages[0]["content"][0]["text"]
-        == "What is the main topic of this legal document?"
-    )
+    assert converted_messages[0]["content"][0]["text"] == "What is the main topic of this legal document?"
 
 
 def test_auto_convert_last_user_message_string_content():
     """Test that last user message with string content is automatically converted to guarded_text when guardrailConfig is present."""
     config = AmazonConverseConfig()
 
-    messages = [
-        {"role": "user", "content": "What is the main topic of this legal document?"}
-    ]
+    messages = [{"role": "user", "content": "What is the main topic of this legal document?"}]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion
     assert len(converted_messages) == 1
     assert converted_messages[0]["role"] == "user"
     assert len(converted_messages[0]["content"]) == 1
     assert converted_messages[0]["content"][0]["type"] == "guarded_text"
-    assert (
-        converted_messages[0]["content"][0]["text"]
-        == "What is the main topic of this legal document?"
-    )
+    assert converted_messages[0]["content"][0]["text"] == "What is the main topic of this legal document?"
 
 
 def test_no_conversion_when_no_guardrail_config():
@@ -2821,9 +2734,7 @@ def test_no_conversion_when_no_guardrail_config():
     optional_params = {}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify no conversion happened
     assert converted_messages == messages
@@ -2840,14 +2751,10 @@ def test_no_conversion_when_guarded_text_already_present():
         }
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify no conversion happened
     assert converted_messages == messages
@@ -2873,14 +2780,10 @@ def test_auto_convert_with_mixed_content():
         }
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion
     assert len(converted_messages) == 1
@@ -2889,17 +2792,11 @@ def test_auto_convert_with_mixed_content():
 
     # First element should be converted to guarded_text
     assert converted_messages[0]["content"][0]["type"] == "guarded_text"
-    assert (
-        converted_messages[0]["content"][0]["text"]
-        == "What is the main topic of this legal document?"
-    )
+    assert converted_messages[0]["content"][0]["text"] == "What is the main topic of this legal document?"
 
     # Second element should remain unchanged
     assert converted_messages[0]["content"][1]["type"] == "image_url"
-    assert (
-        converted_messages[0]["content"][1]["image_url"]["url"]
-        == "https://example.com/image.jpg"
-    )
+    assert converted_messages[0]["content"][1]["image_url"]["url"] == "https://example.com/image.jpg"
 
 
 def test_auto_convert_in_full_transformation():
@@ -2918,9 +2815,7 @@ def test_auto_convert_in_full_transformation():
         }
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the full transformation
     result = config._transform_request(
@@ -2940,10 +2835,7 @@ def test_auto_convert_in_full_transformation():
     assert "content" in message
     assert len(message["content"]) == 1
     assert "guardContent" in message["content"][0]
-    assert (
-        message["content"][0]["guardContent"]["text"]["text"]
-        == "What is the main topic of this legal document?"
-    )
+    assert message["content"][0]["guardContent"]["text"]["text"] == "What is the main topic of this legal document?"
 
 
 def test_convert_consecutive_user_messages_to_guarded_text():
@@ -2957,14 +2849,10 @@ def test_convert_consecutive_user_messages_to_guarded_text():
         {"role": "user", "content": [{"type": "text", "text": "Third user message"}]},
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion - only the last two user messages should be converted
     assert len(converted_messages) == 4
@@ -2999,14 +2887,10 @@ def test_convert_all_user_messages_when_all_consecutive():
         {"role": "user", "content": [{"type": "text", "text": "Third user message"}]},
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify all three user messages are converted
     assert len(converted_messages) == 3
@@ -3030,14 +2914,10 @@ def test_convert_consecutive_user_messages_with_string_content():
         {"role": "user", "content": "Second user message"},
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion
     assert len(converted_messages) == 3
@@ -3070,14 +2950,10 @@ def test_skip_consecutive_user_messages_with_existing_guarded_text():
         {"role": "user", "content": [{"type": "text", "text": "Should be converted"}]},
     ]
 
-    optional_params = {
-        "guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}
-    }
+    optional_params = {"guardrailConfig": {"guardrailIdentifier": "gr-abc123", "guardrailVersion": "1"}}
 
     # Test the helper method directly
-    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(
-        messages, optional_params
-    )
+    converted_messages = config._convert_consecutive_user_messages_to_guarded_text(messages, optional_params)
 
     # Verify the conversion
     assert len(converted_messages) == 2
@@ -3636,24 +3512,22 @@ def test_drop_thinking_param_when_thinking_blocks_missing():
         optional_params = {"thinking": {"type": "enabled", "budget_tokens": 1000}}
 
         # Verify the condition is detected
-        assert last_assistant_with_tool_calls_has_no_thinking_blocks(
-            messages_without_thinking_blocks
-        ), "Should detect missing thinking_blocks"
+        assert last_assistant_with_tool_calls_has_no_thinking_blocks(messages_without_thinking_blocks), (
+            "Should detect missing thinking_blocks"
+        )
 
         # Simulate what _transform_request_helper does
         if (
             optional_params.get("thinking") is not None
             and messages_without_thinking_blocks is not None
-            and last_assistant_with_tool_calls_has_no_thinking_blocks(
-                messages_without_thinking_blocks
-            )
+            and last_assistant_with_tool_calls_has_no_thinking_blocks(messages_without_thinking_blocks)
         ):
             if litellm.modify_params:
                 optional_params.pop("thinking", None)
 
-        assert (
-            "thinking" not in optional_params
-        ), "thinking param should be dropped when modify_params=True and thinking_blocks are missing"
+        assert "thinking" not in optional_params, (
+            "thinking param should be dropped when modify_params=True and thinking_blocks are missing"
+        )
 
         # Test case 2: thinking should NOT be dropped when thinking_blocks are present
         messages_with_thinking_blocks = [
@@ -3668,58 +3542,46 @@ def test_drop_thinking_param_when_thinking_blocks_missing():
                         "function": {"name": "search", "arguments": "{}"},
                     }
                 ],
-                "thinking_blocks": [
-                    {"type": "thinking", "thinking": "Let me search for weather..."}
-                ],
+                "thinking_blocks": [{"type": "thinking", "thinking": "Let me search for weather..."}],
             },
             {"role": "tool", "content": "Weather is sunny", "tool_call_id": "call_123"},
         ]
 
-        optional_params_with_thinking = {
-            "thinking": {"type": "enabled", "budget_tokens": 1000}
-        }
+        optional_params_with_thinking = {"thinking": {"type": "enabled", "budget_tokens": 1000}}
 
         # Verify the condition is NOT detected when thinking_blocks are present
-        assert not last_assistant_with_tool_calls_has_no_thinking_blocks(
-            messages_with_thinking_blocks
-        ), "Should NOT detect missing thinking_blocks when they are present"
+        assert not last_assistant_with_tool_calls_has_no_thinking_blocks(messages_with_thinking_blocks), (
+            "Should NOT detect missing thinking_blocks when they are present"
+        )
 
         # Simulate what _transform_request_helper does
         if (
             optional_params_with_thinking.get("thinking") is not None
             and messages_with_thinking_blocks is not None
-            and last_assistant_with_tool_calls_has_no_thinking_blocks(
-                messages_with_thinking_blocks
-            )
+            and last_assistant_with_tool_calls_has_no_thinking_blocks(messages_with_thinking_blocks)
         ):
             if litellm.modify_params:
                 optional_params_with_thinking.pop("thinking", None)
 
-        assert (
-            "thinking" in optional_params_with_thinking
-        ), "thinking param should NOT be dropped when thinking_blocks are present"
+        assert "thinking" in optional_params_with_thinking, (
+            "thinking param should NOT be dropped when thinking_blocks are present"
+        )
 
         # Test case 3: thinking should NOT be dropped when modify_params=False
         litellm.modify_params = False
 
-        optional_params_no_modify = {
-            "thinking": {"type": "enabled", "budget_tokens": 1000}
-        }
+        optional_params_no_modify = {"thinking": {"type": "enabled", "budget_tokens": 1000}}
 
         # Simulate what _transform_request_helper does
         if (
             optional_params_no_modify.get("thinking") is not None
             and messages_without_thinking_blocks is not None
-            and last_assistant_with_tool_calls_has_no_thinking_blocks(
-                messages_without_thinking_blocks
-            )
+            and last_assistant_with_tool_calls_has_no_thinking_blocks(messages_without_thinking_blocks)
         ):
             if litellm.modify_params:
                 optional_params_no_modify.pop("thinking", None)
 
-        assert (
-            "thinking" in optional_params_no_modify
-        ), "thinking param should NOT be dropped when modify_params=False"
+        assert "thinking" in optional_params_no_modify, "thinking param should NOT be dropped when modify_params=False"
 
     finally:
         # Restore original modify_params setting
@@ -3740,31 +3602,17 @@ def test_supports_native_structured_outputs(monkeypatch):
         config = AmazonConverseConfig()
 
         # Supported models (have supports_native_structured_output=true in cost JSON)
-        assert config._supports_native_structured_outputs(
-            "anthropic.claude-sonnet-4-5-20250929-v1:0"
-        )
-        assert config._supports_native_structured_outputs(
-            "anthropic.claude-haiku-4-5-20251001-v1:0"
-        )
-        assert config._supports_native_structured_outputs(
-            "anthropic.claude-opus-4-6-v1"
-        )
+        assert config._supports_native_structured_outputs("anthropic.claude-sonnet-4-5-20250929-v1:0")
+        assert config._supports_native_structured_outputs("anthropic.claude-haiku-4-5-20251001-v1:0")
+        assert config._supports_native_structured_outputs("anthropic.claude-opus-4-6-v1")
         # Regional prefix is stripped by get_bedrock_base_model
-        assert config._supports_native_structured_outputs(
-            "eu.anthropic.claude-opus-4-5-20251101-v1:0"
-        )
+        assert config._supports_native_structured_outputs("eu.anthropic.claude-opus-4-5-20251101-v1:0")
         # Claude 4.6 Sonnet
         assert config._supports_native_structured_outputs("anthropic.claude-sonnet-4-6")
-        assert config._supports_native_structured_outputs(
-            "us.anthropic.claude-sonnet-4-6"
-        )
+        assert config._supports_native_structured_outputs("us.anthropic.claude-sonnet-4-6")
         # Non-Anthropic models
-        assert config._supports_native_structured_outputs(
-            "qwen.qwen3-235b-a22b-2507-v1:0"
-        )
-        assert config._supports_native_structured_outputs(
-            "mistral.mistral-large-3-675b-instruct"
-        )
+        assert config._supports_native_structured_outputs("qwen.qwen3-235b-a22b-2507-v1:0")
+        assert config._supports_native_structured_outputs("mistral.mistral-large-3-675b-instruct")
         assert config._supports_native_structured_outputs("minimax.minimax-m2")
         assert config._supports_native_structured_outputs("moonshot.kimi-k2-thinking")
         assert config._supports_native_structured_outputs("nvidia.nemotron-nano-3-30b")
@@ -3774,23 +3622,15 @@ def test_supports_native_structured_outputs(monkeypatch):
         assert config._supports_native_structured_outputs("zai.glm-5")
 
         # Unsupported models -- should fall back to tool-call approach
-        assert not config._supports_native_structured_outputs(
-            "anthropic.claude-sonnet-4-20250514-v1:0"
-        )
-        assert not config._supports_native_structured_outputs(
-            "meta.llama3-3-70b-instruct-v1:0"
-        )
+        assert not config._supports_native_structured_outputs("anthropic.claude-sonnet-4-20250514-v1:0")
+        assert not config._supports_native_structured_outputs("meta.llama3-3-70b-instruct-v1:0")
         assert not config._supports_native_structured_outputs("amazon.nova-pro-v1:0")
         # Excluded: broken constrained decoding on Bedrock
         assert not config._supports_native_structured_outputs("openai.gpt-oss-120b-1:0")
-        assert not config._supports_native_structured_outputs(
-            "mistral.magistral-small-2509"
-        )
+        assert not config._supports_native_structured_outputs("mistral.magistral-small-2509")
         # Excluded: ignores schema or broken on Bedrock
         assert not config._supports_native_structured_outputs("google.gemma-3-27b-it")
-        assert not config._supports_native_structured_outputs(
-            "nvidia.nemotron-nano-12b-v2"
-        )
+        assert not config._supports_native_structured_outputs("nvidia.nemotron-nano-12b-v2")
     finally:
         litellm.model_cost = old_cost
         if old_env is None:
@@ -3876,19 +3716,14 @@ def test_translate_response_format_native_output_config(monkeypatch):
         assert "fake_stream" not in result
 
         # Verify the schema content (additionalProperties: false is added by normalization)
-        schema_str = result["outputConfig"]["textFormat"]["structure"]["jsonSchema"][
-            "schema"
-        ]
+        schema_str = result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["schema"]
         parsed_schema = json.loads(schema_str)
         expected_schema = {
             **response_format["json_schema"]["schema"],
             "additionalProperties": False,
         }
         assert parsed_schema == expected_schema
-        assert (
-            result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["name"]
-            == "WeatherResult"
-        )
+        assert result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["name"] == "WeatherResult"
     finally:
         litellm.model_cost = old_cost
         if old_env is None:
@@ -3966,9 +3801,7 @@ def test_native_structured_output_no_fake_stream(monkeypatch):
         assert "fake_stream" not in result
 
         # Verify the schema content
-        schema_str = result["outputConfig"]["textFormat"]["structure"]["jsonSchema"][
-            "schema"
-        ]
+        schema_str = result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["schema"]
         assert json.loads(schema_str) == {
             "type": "object",
             "properties": {"answer": {"type": "string"}},
@@ -4021,10 +3854,7 @@ def test_transform_request_with_output_config():
 
     assert "outputConfig" in result
     assert result["outputConfig"]["textFormat"]["type"] == "json_schema"
-    assert (
-        result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["name"]
-        == "TestSchema"
-    )
+    assert result["outputConfig"]["textFormat"]["structure"]["jsonSchema"]["name"] == "TestSchema"
 
 
 def test_transform_request_strips_anthropic_output_config():
@@ -4145,10 +3975,7 @@ def test_transform_response_native_structured_output():
     )
 
     # Content should be the JSON text directly
-    assert (
-        result.choices[0].message.content
-        == '{"temp": 62, "description": "Mild and foggy"}'
-    )
+    assert result.choices[0].message.content == '{"temp": 62, "description": "Mild and foggy"}'
     # Should NOT have tool_calls
     assert result.choices[0].message.tool_calls is None
     assert result.choices[0].finish_reason == "stop"
@@ -4261,10 +4088,7 @@ def test_add_additional_properties_definitions():
     # definitions object
     assert result["definitions"]["Item"]["additionalProperties"] is False
     # Nested object inside definitions
-    assert (
-        result["definitions"]["Item"]["properties"]["details"]["additionalProperties"]
-        is False
-    )
+    assert result["definitions"]["Item"]["properties"]["details"]["additionalProperties"] is False
 
 
 def test_json_object_no_schema_skips_tool_injection(monkeypatch):
@@ -4321,9 +4145,7 @@ def test_output_config_applies_additional_properties():
     output_config = AmazonConverseConfig._create_output_config_for_response_format(
         json_schema=schema, name="test_schema"
     )
-    parsed = json.loads(
-        output_config["textFormat"]["structure"]["jsonSchema"]["schema"]
-    )
+    parsed = json.loads(output_config["textFormat"]["structure"]["jsonSchema"]["schema"])
     assert parsed["additionalProperties"] is False
     assert parsed["properties"]["nested"]["additionalProperties"] is False
 
@@ -4372,12 +4194,7 @@ def test_parallel_tool_calls_newer_model_adds_disable_flag():
 
     assert "additionalModelRequestFields" in request_data
     assert "tool_choice" in request_data["additionalModelRequestFields"]
-    assert (
-        request_data["additionalModelRequestFields"]["tool_choice"][
-            "disable_parallel_tool_use"
-        ]
-        is True
-    )
+    assert request_data["additionalModelRequestFields"]["tool_choice"]["disable_parallel_tool_use"] is True
     assert "parallel_tool_calls" not in request_data["additionalModelRequestFields"]
 
 
@@ -4409,12 +4226,7 @@ def test_parallel_tool_calls_flag_decoupled_from_ttl_pricing(monkeypatch):
         headers={},
     )
 
-    assert (
-        request_data["additionalModelRequestFields"]["tool_choice"][
-            "disable_parallel_tool_use"
-        ]
-        is True
-    )
+    assert request_data["additionalModelRequestFields"]["tool_choice"]["disable_parallel_tool_use"] is True
 
 
 def test_parallel_tool_calls_older_model_drops_disable_flag():
@@ -4561,9 +4373,7 @@ def test_parallel_tool_use_merge_preserves_user_tool_choice_type():
 class TestBedrockMinThinkingBudgetTokens:
     """Test that thinking.budget_tokens is clamped to the Bedrock minimum (1024)."""
 
-    def _map_params(
-        self, thinking_value, model="anthropic.claude-sonnet-4-5-20250929-v1:0"
-    ):
+    def _map_params(self, thinking_value, model="anthropic.claude-sonnet-4-5-20250929-v1:0"):
         """Helper to call map_openai_params with the given thinking value."""
         config = AmazonConverseConfig()
         non_default_params = {"thinking": thinking_value}
@@ -4790,9 +4600,7 @@ def test_streaming_filters_json_tool_call_with_real_tools():
 
     # Chunk 2: json_tool_call delta — should become text, not tool_use
     json_delta = ContentBlockDeltaEvent(toolUse={"input": '{"temp": 62}'})
-    text_2, tool_use_2, _, _, _ = decoder._handle_converse_delta_event(
-        json_delta, index=0
-    )
+    text_2, tool_use_2, _, _, _ = decoder._handle_converse_delta_event(json_delta, index=0)
     assert text_2 == '{"temp": 62}'
     assert tool_use_2 is None
 
@@ -4816,9 +4624,7 @@ def test_streaming_filters_json_tool_call_with_real_tools():
 
     # Chunk 5: real tool delta
     real_delta = ContentBlockDeltaEvent(toolUse={"input": '{"location": "SF"}'})
-    text_5, tool_use_5, _, _, _ = decoder._handle_converse_delta_event(
-        real_delta, index=1
-    )
+    text_5, tool_use_5, _, _, _ = decoder._handle_converse_delta_event(real_delta, index=1)
     assert text_5 == ""
     assert tool_use_5 is not None
     assert tool_use_5["function"]["arguments"] == '{"location": "SF"}'
@@ -4851,9 +4657,7 @@ def test_streaming_without_json_mode_passes_all_tools():
 
     # json_tool_call delta — should be a tool_use, not text
     json_delta = ContentBlockDeltaEvent(toolUse={"input": '{"data": 1}'})
-    text, tool_use_delta, _, _, _ = decoder._handle_converse_delta_event(
-        json_delta, index=0
-    )
+    text, tool_use_delta, _, _, _ = decoder._handle_converse_delta_event(json_delta, index=0)
     assert text == ""
     assert tool_use_delta is not None
     assert tool_use_delta["function"]["arguments"] == '{"data": 1}'
@@ -5337,11 +5141,7 @@ def test_transform_response_citation_null_source_title_become_empty_strings():
                 "content": [
                     {
                         "citationsContent": {
-                            "content": [
-                                {
-                                    "text": "Apptio is a company that makes calls to Bedrock"
-                                }
-                            ],
+                            "content": [{"text": "Apptio is a company that makes calls to Bedrock"}],
                             "citations": [
                                 {
                                     "location": {
@@ -5476,15 +5276,11 @@ def test_transform_response_citations_offset_tracks_text_only_blocks():
     message = result.choices[0].message
     expected_start = len(leading_text)
     assert message.content == leading_text + cited_text
-    assert (
-        message.content[expected_start : expected_start + len(cited_text)] == cited_text
-    )
+    assert message.content[expected_start : expected_start + len(cited_text)] == cited_text
     assert message.annotations is not None
     assert len(message.annotations) == 1
     assert message.annotations[0]["url_citation"]["start_index"] == expected_start
-    assert message.annotations[0]["url_citation"]["end_index"] == expected_start + len(
-        cited_text
-    )
+    assert message.annotations[0]["url_citation"]["end_index"] == expected_start + len(cited_text)
 
 
 def test_transform_response_stitches_citations_for_whitespace_punctuation_text():
@@ -5594,9 +5390,7 @@ def test_bedrock_tool_message_openai_file_pdf_becomes_document():
         },
     ]
 
-    translated_msg = _bedrock_converse_messages_pt(
-        messages=messages, model="", llm_provider=""
-    )
+    translated_msg = _bedrock_converse_messages_pt(messages=messages, model="", llm_provider="")
 
     tool_result = translated_msg[-1]["content"][-1]["toolResult"]
     assert tool_result["toolUseId"] == "tooluse_pdf_1"
@@ -5638,9 +5432,7 @@ def test_bedrock_tool_message_image_url_pdf_data_uri_becomes_document():
         },
     ]
 
-    translated_msg = _bedrock_converse_messages_pt(
-        messages=messages, model="", llm_provider=""
-    )
+    translated_msg = _bedrock_converse_messages_pt(messages=messages, model="", llm_provider="")
 
     tool_result = translated_msg[-1]["content"][-1]["toolResult"]
     assert tool_result["toolUseId"] == "tooluse_pdf_img_1"
@@ -5697,9 +5489,7 @@ def test_bedrock_tool_message_file_id_http_url_becomes_document():
         "process_image_sync",
         return_value=fake_document_block,
     ) as mock_proc:
-        translated_msg = _bedrock_converse_messages_pt(
-            messages=messages, model="", llm_provider=""
-        )
+        translated_msg = _bedrock_converse_messages_pt(messages=messages, model="", llm_provider="")
 
     mock_proc.assert_called_once()
     assert mock_proc.call_args.kwargs["image_url"] == pdf_url
@@ -5770,9 +5560,7 @@ def test_bedrock_tool_message_image_url_png_still_becomes_image():
         },
     ]
 
-    translated_msg = _bedrock_converse_messages_pt(
-        messages=messages, model="", llm_provider=""
-    )
+    translated_msg = _bedrock_converse_messages_pt(messages=messages, model="", llm_provider="")
 
     tool_result = translated_msg[-1]["content"][-1]["toolResult"]
     assert len(tool_result["content"]) == 1
@@ -5964,12 +5752,10 @@ async def test_grounding_source_and_query_rendered_as_text():
         model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
         llm_provider="bedrock_converse",
     )
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0",
+        llm_provider="bedrock_converse",
     )
 
     assert result == async_result
@@ -6014,10 +5800,7 @@ def _agentic_messages_with_ttl(ttl_target: str):
 
 def _collect_cache_points(result):
     return [
-        block["cachePoint"]
-        for message in result
-        for block in message.get("content") or []
-        if "cachePoint" in block
+        block["cachePoint"] for message in result for block in message.get("content") or [] if "cachePoint" in block
     ]
 
 
@@ -6043,12 +5826,10 @@ async def test_message_level_cache_control_honors_ttl_for_supported_model(
         model="global.anthropic.claude-opus-4-7",
         llm_provider="bedrock_converse",
     )
-    async_result = (
-        await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
-            messages=messages,
-            model="global.anthropic.claude-opus-4-7",
-            llm_provider="bedrock_converse",
-        )
+    async_result = await BedrockConverseMessagesProcessor._bedrock_converse_messages_pt_async(
+        messages=messages,
+        model="global.anthropic.claude-opus-4-7",
+        llm_provider="bedrock_converse",
     )
     assert result == async_result
 
@@ -6276,7 +6057,6 @@ def test_update_optional_params_with_thinking_tokens_bool_thinking_does_not_cras
     assert "maxTokens" not in optional_params
 
 
-
 @pytest.mark.parametrize(
     "model, expected_dropped",
     [
@@ -6285,9 +6065,7 @@ def test_update_optional_params_with_thinking_tokens_bool_thinking_does_not_cras
         ("us.anthropic.claude-opus-4-8", False),
     ],
 )
-def test_disabled_thinking_omitted_for_always_on_models_converse(
-    local_model_cost_map, model, expected_dropped
-):
+def test_disabled_thinking_omitted_for_always_on_models_converse(local_model_cost_map, model, expected_dropped):
     """Bedrock Converse: ``thinking={"type": "disabled"}`` is omitted for always-on-thinking
     models and forwarded verbatim for models that accept it."""
     config = AmazonConverseConfig()
@@ -6305,3 +6083,44 @@ def test_disabled_thinking_omitted_for_always_on_models_converse(
         assert "thinking" not in additional
     else:
         assert additional.get("thinking") == {"type": "disabled"}
+
+
+def test_reasoning_effort_accepts_dict_shape_like_string():
+    """OpenAI Responses callers send reasoning_effort as a dict
+    ({'effort': 'low', 'summary': ...}); the Responses->Chat parser keeps the
+    full dict when `summary` is set (#25359 / #28196). Bedrock Converse must
+    coerce it to the same result as the bare string instead of dropping it."""
+    config = AmazonConverseConfig()
+    model = "bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0"
+
+    from_string = config.map_openai_params(
+        non_default_params={"reasoning_effort": "low"},
+        optional_params={},
+        model=model,
+        drop_params=False,
+    )
+    from_dict = config.map_openai_params(
+        non_default_params={"reasoning_effort": {"effort": "low", "summary": "concise"}},
+        optional_params={},
+        model=model,
+        drop_params=False,
+    )
+
+    assert "thinking" in from_string
+    assert from_dict == from_string
+
+
+def test_reasoning_effort_dict_without_string_effort_is_skipped():
+    """A reasoning_effort dict lacking a string `effort` must be skipped rather
+    than crash the mapping or leak the raw dict downstream."""
+    config = AmazonConverseConfig()
+
+    optional_params = config.map_openai_params(
+        non_default_params={"reasoning_effort": {"summary": "concise"}},
+        optional_params={},
+        model="bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+        drop_params=False,
+    )
+
+    assert "thinking" not in optional_params
+    assert "reasoning_effort" not in optional_params