diff --git a/litellm/llms/openai/responses/transformation.py b/litellm/llms/openai/responses/transformation.py
index d5c4f1beebd..314a1d22508 100644
--- a/litellm/llms/openai/responses/transformation.py
+++ b/litellm/llms/openai/responses/transformation.py
@@ -78,7 +78,7 @@ _MODEL_FAMILIES_REJECTING_TOP_LEVEL_SCHEMA_COMBINATORS: Final = ("gpt-4", "gpt-3
 _PROVIDERS_WITH_OPENAI_SCHEMA_VALIDATOR: Final = frozenset({LlmProviders.AZURE, LlmProviders.OPENAI})
 _PROVIDERS_VALIDATING_TOOL_CALL_ITEM_IDS: Final = frozenset({LlmProviders.AZURE, LlmProviders.OPENAI})
 _PROVIDERS_REPLAYING_ONLY_THEIR_OWN_REASONING: Final = frozenset(
-    {LlmProviders.AZURE, LlmProviders.BEDROCK, LlmProviders.OPENAI}
+    {LlmProviders.AZURE, LlmProviders.BEDROCK, LlmProviders.BEDROCK_MANTLE, LlmProviders.OPENAI}
 )
 _ROLES_READING_PROMPT_CACHE_BREAKPOINTS: Final = frozenset({"system", "developer", "user"})
 _PART_TYPES_READING_PROMPT_CACHE_BREAKPOINTS: Final = frozenset({"input_text", "input_image", "input_file"})
diff --git a/tests/unit/llms/openai/responses/test_openai_responses_transformation.py b/tests/unit/llms/openai/responses/test_openai_responses_transformation.py
index f4d0e8fe77f..cd300d74b59 100644
--- a/tests/unit/llms/openai/responses/test_openai_responses_transformation.py
+++ b/tests/unit/llms/openai/responses/test_openai_responses_transformation.py
@@ -18,6 +18,7 @@ from litellm.llms.azure.responses.transformation import AzureOpenAIResponsesAPIC
 from litellm.llms.azure_ai.responses.transformation import AzureAIResponsesAPIConfig
 from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
 from litellm.llms.bedrock.responses.transformation import BedrockOpenAIResponsesConfig
+from litellm.llms.bedrock_mantle.responses.transformation import BedrockMantleResponsesAPIConfig
 from litellm.llms.hosted_vllm.responses.transformation import HostedVLLMResponsesAPIConfig
 from litellm.llms.openai.responses.transformation import OpenAIResponsesAPIConfig
 from litellm.llms.xai.responses.transformation import XAIResponsesAPIConfig
@@ -1352,7 +1353,13 @@ class TestOpenAIResponsesAPIConfig:
         return list(bridged.output)
 
     @pytest.mark.parametrize(
-        "config", [OpenAIResponsesAPIConfig(), AzureOpenAIResponsesAPIConfig(), BedrockOpenAIResponsesConfig()]
+        "config",
+        [
+            OpenAIResponsesAPIConfig(),
+            AzureOpenAIResponsesAPIConfig(),
+            BedrockOpenAIResponsesConfig(),
+            BedrockMantleResponsesAPIConfig(),
+        ],
     )
     def test_claude_reasoning_minted_by_the_bridge_is_dropped_before_the_history_reaches_openai(self, config):
         saved_claude_turn = json.loads(