diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index 1393c6838606..92a6d22547af 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -42795,6 +42795,26 @@
         "supports_tool_choice": true,
         "supports_vision": true
     },
+    "bedrock_mantle/xai.grok-4.3": {
+        "input_cost_per_token": 1.25e-06,
+        "output_cost_per_token": 2.5e-06,
+        "litellm_provider": "bedrock_mantle",
+        "max_input_tokens": 1000000,
+        "max_output_tokens": 128000,
+        "max_tokens": 128000,
+        "mode": "chat",
+        "use_openai_responses_path": true,
+        "supported_endpoints": ["/v1/chat/completions", "/v1/responses"],
+        "supported_modalities": ["text", "image"],
+        "supported_output_modalities": ["text"],
+        "supports_function_calling": true,
+        "supports_none_reasoning_effort": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true,
+        "source": "https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-xai-grok-4-3.html"
+    },
     "volcengine/doubao-seed-2-0-pro-260215": {
         "litellm_provider": "volcengine",
         "max_input_tokens": 256000,
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index 9867874cb658..2484eb91769a 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -43197,6 +43197,26 @@
         "supports_tool_choice": true,
         "supports_vision": true
     },
+    "bedrock_mantle/xai.grok-4.3": {
+        "input_cost_per_token": 1.25e-06,
+        "output_cost_per_token": 2.5e-06,
+        "litellm_provider": "bedrock_mantle",
+        "max_input_tokens": 1000000,
+        "max_output_tokens": 128000,
+        "max_tokens": 128000,
+        "mode": "chat",
+        "use_openai_responses_path": true,
+        "supported_endpoints": ["/v1/chat/completions", "/v1/responses"],
+        "supported_modalities": ["text", "image"],
+        "supported_output_modalities": ["text"],
+        "supports_function_calling": true,
+        "supports_none_reasoning_effort": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true,
+        "source": "https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-xai-grok-4-3.html"
+    },
     "volcengine/doubao-seed-2-0-pro-260215": {
         "litellm_provider": "volcengine",
         "max_input_tokens": 256000,
diff --git a/tests/test_litellm/llms/bedrock_mantle/test_bedrock_mantle_responses_transformation.py b/tests/test_litellm/llms/bedrock_mantle/test_bedrock_mantle_responses_transformation.py
index 94efc7c51efd..a827e8f24245 100644
--- a/tests/test_litellm/llms/bedrock_mantle/test_bedrock_mantle_responses_transformation.py
+++ b/tests/test_litellm/llms/bedrock_mantle/test_bedrock_mantle_responses_transformation.py
@@ -714,6 +714,20 @@ class TestMantleSupportsResponses:
                 {"bedrock_mantle/google.gemma-3-27b-it": {"mode": "chat"}},
                 False,
             ),
+            # grok-4.3 on mantle openai/v1 responses path
+            (
+                "xai.grok-4.3",
+                {
+                    "bedrock_mantle/xai.grok-4.3": {
+                        "mode": "chat",
+                        "supported_endpoints": [
+                            "/v1/chat/completions",
+                            "/v1/responses",
+                        ],
+                    }
+                },
+                True,
+            ),
             # absent from model_cost -> no signal -> not supported
             ("somelab.unmapped", {}, False),
             (None, {}, False),
@@ -759,6 +773,10 @@ def test_gemma_4_uses_openai_responses_path(self, local_cost_map, model):
         url = self._url_for(model)
         assert url == "https://bedrock-mantle.us-east-2.api.aws/openai/v1/responses"
 
+    def test_grok_4_3_uses_openai_responses_path(self, local_cost_map):
+        url = self._url_for("xai.grok-4.3")
+        assert url == "https://bedrock-mantle.us-east-2.api.aws/openai/v1/responses"
+
 
 class TestBedrockMantleEndpointHonoring:
     def test_plain_chat_call_to_gpt_oss_is_not_bridged(self, local_cost_map):
@@ -1230,3 +1248,15 @@ def test_gpt_5_4_pricing_and_mode(self, local_cost_map):
     def test_models_registered(self, local_cost_map):
         assert "bedrock_mantle/openai.gpt-5.5" in litellm.bedrock_mantle_models
         assert "bedrock_mantle/openai.gpt-5.4" in litellm.bedrock_mantle_models
+        assert "bedrock_mantle/xai.grok-4.3" in litellm.bedrock_mantle_models
+
+    def test_grok_4_3_pricing_and_capabilities(self, local_cost_map):
+        info = litellm.get_model_info("bedrock_mantle/xai.grok-4.3")
+        assert info["mode"] == "chat"
+        assert info["input_cost_per_token"] == pytest.approx(1.25e-06)
+        assert info["output_cost_per_token"] == pytest.approx(2.5e-06)
+        assert info["max_input_tokens"] == 1000000
+        assert info["supports_none_reasoning_effort"] is True
+        from litellm.llms.bedrock_mantle.common_utils import mantle_base_segment
+
+        assert mantle_base_segment("xai.grok-4.3", litellm.model_cost) == "openai/v1"