diff --git a/tests/integration/defs/accuracy/accuracy_core.py b/tests/integration/defs/accuracy/accuracy_core.py
index 7694cdb5581..16d27f474c5 100644
--- a/tests/integration/defs/accuracy/accuracy_core.py
+++ b/tests/integration/defs/accuracy/accuracy_core.py
@@ -433,6 +433,108 @@ class PassKeyRetrieval128k(AccuracyTask):
     MAX_OUTPUT_LEN = 50
 
 
+class LongBenchV2(AccuracyTask):
+    DATASET = "longbench_v2"
+    DATASET_DIR = f"{llm_models_root()}/zai-org/LongBench-v2"
+
+    ALPHA = 0.05
+    BETA = 0.2
+    SIGMA = 50.0
+    NUM_SAMPLES = 215
+
+    MAX_BATCH_SIZE = 32
+    MAX_INPUT_LEN = 1280000
+    MAX_OUTPUT_LEN = 32000
+
+    EVALUATOR_CLS = tensorrt_llm.evaluate.LongBenchV2
+    EVALUATOR_KWARGS = dict(
+        dataset_path=DATASET_DIR,
+        length="medium",
+        max_len=1280000,
+        apply_chat_template=True,
+        random_seed=0,
+    )
+
+    @staticmethod
+    def create_modified_model_dir(original_model_dir: str,
+                                  max_position_embeddings: int = 1280000,
+                                  model_max_length: int = 1280000) -> str:
+        """
+        Create temporary directory with modified config files for long context evaluation.
+
+        This method creates a temporary directory with symlinks to all model files except
+        config files, which are copied and modified to support longer context lengths.
+        This is useful for evaluating models on long context tasks that exceed the
+        original model's max_position_embeddings.
+
+        Args:
+            original_model_dir: Path to the original model directory
+            max_position_embeddings: New value for max_position_embeddings in config.json
+            model_max_length: New value for model_max_length in tokenizer_config.json
+
+        Returns:
+            Path to the temporary modified model directory
+
+        Note:
+            The caller is responsible for cleaning up the temporary directory after use.
+        """
+        import tempfile
+
+        # Create temporary model directory with symlinks
+        temp_dir = tempfile.mkdtemp(prefix="longbench_v2_modified_model_")
+        logger.info(f"Created temporary model directory: {temp_dir}")
+
+        # Create symlinks for all files except config files
+        for item in os.listdir(original_model_dir):
+            src = os.path.join(original_model_dir, item)
+            dst = os.path.join(temp_dir, item)
+
+            # Skip config files - will handle them separately
+            if item in ["config.json", "tokenizer_config.json"]:
+                continue
+
+            # Create symlink for other files/directories
+            os.symlink(src, dst)
+            logger.info(f"  Symlinked: {item}")
+
+        # Modify and copy config.json
+        config_src = os.path.join(original_model_dir, "config.json")
+        config_dst = os.path.join(temp_dir, "config.json")
+        if os.path.exists(config_src):
+            with open(config_src, 'r', encoding='utf-8') as f:
+                config = json.load(f)
+
+            # Modify max_position_embeddings
+            original_max_pos = config.get('max_position_embeddings')
+            config['max_position_embeddings'] = max_position_embeddings
+            logger.info(
+                f"  Modified config.json: max_position_embeddings {original_max_pos} -> {max_position_embeddings}"
+            )
+
+            with open(config_dst, 'w', encoding='utf-8') as f:
+                json.dump(config, f, indent=2, ensure_ascii=False)
+
+        # Modify and copy tokenizer_config.json
+        tokenizer_config_src = os.path.join(original_model_dir,
+                                            "tokenizer_config.json")
+        tokenizer_config_dst = os.path.join(temp_dir, "tokenizer_config.json")
+        if os.path.exists(tokenizer_config_src):
+            with open(tokenizer_config_src, 'r', encoding='utf-8') as f:
+                tokenizer_config = json.load(f)
+
+            # Modify model_max_length
+            original_max_len = tokenizer_config.get('model_max_length')
+            tokenizer_config['model_max_length'] = model_max_length
+            logger.info(
+                f"  Modified tokenizer_config.json: model_max_length {original_max_len} -> {model_max_length}"
+            )
+
+            with open(tokenizer_config_dst, 'w', encoding='utf-8') as f:
+                json.dump(tokenizer_config, f, indent=2, ensure_ascii=False)
+
+        return temp_dir
+
+
 class CliFlowAccuracyTestHarness:
     # Model
     MODEL_NAME = None
diff --git a/tests/integration/defs/accuracy/references/longbench_v2.yaml b/tests/integration/defs/accuracy/references/longbench_v2.yaml
new file mode 100644
index 00000000000..357dc405097
--- /dev/null
+++ b/tests/integration/defs/accuracy/references/longbench_v2.yaml
@@ -0,0 +1,9 @@
+DeepSeek-R1-0528:
+  - quant_algo: FP8_BLOCK_SCALES
+    kv_cache_quant_algo: FP8
+    spec_dec_algo: MTP
+    accuracy: 52.093
+  - quant_algo: NVFP4
+    kv_cache_quant_algo: FP8
+    spec_dec_algo: MTP
+    accuracy: 52.093
diff --git a/tests/integration/defs/accuracy/test_llm_api_pytorch.py b/tests/integration/defs/accuracy/test_llm_api_pytorch.py
index 322e3335c35..d6dbe39f37c 100644
--- a/tests/integration/defs/accuracy/test_llm_api_pytorch.py
+++ b/tests/integration/defs/accuracy/test_llm_api_pytorch.py
@@ -33,7 +33,8 @@
                         skip_post_blackwell, skip_pre_ada, skip_pre_blackwell,
                         skip_pre_hopper, skip_ray)
 from .accuracy_core import (GSM8K, MMLU, CnnDailymail, GPQADiamond,
-                            JsonModeEval, LlmapiAccuracyTestHarness)
+                            JsonModeEval, LlmapiAccuracyTestHarness,
+                            LongBenchV2)
 
 
 class TestLlama3_1_8B(LlmapiAccuracyTestHarness):
@@ -4136,3 +4137,110 @@ def test_auto_dtype(self):
                           extra_evaluator_kwargs=dict(
                               apply_chat_template=True,
                               chat_template_kwargs=chat_template_kwargs))
+
+
+@skip_pre_blackwell
+@pytest.mark.skip_less_device_memory(183000)
+@pytest.mark.timeout(28800)
+class TestDeepSeekR1LongBenchV2(LlmapiAccuracyTestHarness):
+    MODEL_NAME = "DeepSeek-R1-0528"
+
+    @pytest.mark.skip_less_mpi_world_size(8)
+    def test_fp8_8gpus(self):
+        original_model_dir = f"{llm_models_root()}/DeepSeek-R1/DeepSeek-R1-0528"
+        if not os.path.exists(original_model_dir):
+            pytest.skip(f"Model directory {original_model_dir} does not exist")
+
+        temp_dir = None
+        try:
+            # Create modified model directory using LongBenchV2 static method
+            # This is a WAR for the fact that the model config is not modified to support long context.
+            # TODO: remove this once the model config is modified to support long context.
+            temp_dir = LongBenchV2.create_modified_model_dir(original_model_dir)
+
+            # Configure model settings
+            kv_cache_config = KvCacheConfig(free_gpu_memory_fraction=0.8,
+                                            enable_block_reuse=True,
+                                            enable_partial_reuse=False,
+                                            dtype="fp8")
+
+            cuda_graph_config = CudaGraphConfig(enable_padding=True,
+                                                max_batch_size=32)
+
+            mtp_config = MTPDecodingConfig(num_nextn_predict_layers=3)
+
+            moe_config = MoeConfig(backend='DEEPGEMM', max_num_tokens=32000)
+
+            pytorch_config = dict(cuda_graph_config=cuda_graph_config,
+                                  kv_cache_config=kv_cache_config,
+                                  speculative_config=mtp_config,
+                                  moe_config=moe_config,
+                                  enable_chunked_prefill=True,
+                                  enable_autotuner=True)
+
+            # Create LLM instance and evaluate
+            with LLM(temp_dir,
+                     tensor_parallel_size=8,
+                     moe_expert_parallel_size=8,
+                     max_num_tokens=32000,
+                     max_batch_size=32,
+                     **pytorch_config) as llm:
+
+                task = LongBenchV2(self.MODEL_NAME)
+
+                sampling_params = SamplingParams(max_tokens=32000)
+
+                task.evaluate(llm, sampling_params=sampling_params)
+
+        finally:
+            # Cleanup temporary files
+            if temp_dir and os.path.exists(temp_dir):
+                import shutil
+                shutil.rmtree(temp_dir, ignore_errors=True)
+
+    @pytest.mark.skip_less_mpi_world_size(4)
+    def test_nvfp4_4gpus(self):
+        original_model_dir = f"{llm_models_root()}/DeepSeek-R1/DeepSeek-R1-0528-FP4"
+        temp_dir = None
+        try:
+            # Create modified model directory using LongBenchV2 static method
+            temp_dir = LongBenchV2.create_modified_model_dir(original_model_dir)
+
+            # Configure model settings (no MOE config for FP4 version)
+            kv_cache_config = KvCacheConfig(free_gpu_memory_fraction=0.8,
+                                            enable_block_reuse=True,
+                                            enable_partial_reuse=False,
+                                            dtype="fp8")
+
+            cuda_graph_config = CudaGraphConfig(enable_padding=True,
+                                                max_batch_size=32)
+
+            mtp_config = MTPDecodingConfig(num_nextn_predict_layers=3)
+
+            pytorch_config = dict(cuda_graph_config=cuda_graph_config,
+                                  kv_cache_config=kv_cache_config,
+                                  speculative_config=mtp_config,
+                                  enable_chunked_prefill=True,
+                                  enable_autotuner=True)
+
+            # Create LLM instance and evaluate
+            with LLM(temp_dir,
+                     tensor_parallel_size=4,
+                     moe_expert_parallel_size=4,
+                     max_num_tokens=32000,
+                     max_batch_size=32,
+                     **pytorch_config) as llm:
+
+                assert llm.args.quant_config.quant_algo == QuantAlgo.NVFP4
+
+                task = LongBenchV2(self.MODEL_NAME)
+
+                sampling_params = SamplingParams(max_tokens=32000)
+
+                task.evaluate(llm, sampling_params=sampling_params)
+
+        finally:
+            # Cleanup temporary files
+            if temp_dir and os.path.exists(temp_dir):
+                import shutil
+                shutil.rmtree(temp_dir, ignore_errors=True)
diff --git a/tests/integration/test_lists/qa/llm_function_stress.txt b/tests/integration/test_lists/qa/llm_function_stress.txt
index a4aac892ad4..4ce6dd41789 100644
--- a/tests/integration/test_lists/qa/llm_function_stress.txt
+++ b/tests/integration/test_lists/qa/llm_function_stress.txt
@@ -1,3 +1,5 @@
 stress_test/stress_test.py::test_run_stress_test[DeepSeek-V3_tp8-stress_time_3600s_timeout_5400s-GUARANTEED_NO_EVICT-pytorch-stress-test-with-accuracy]
 stress_test/stress_test.py::test_run_stress_test[DeepSeek-V3_tp8-stress_time_3600s_timeout_5400s-MAX_UTILIZATION-pytorch-stress-test-with-accuracy]
 stress_test/stress_test.py::test_run_stress_test[DeepSeek-R1_tp8-stress_time_3600s_timeout_5400s-MAX_UTILIZATION-pytorch-stress-test-with-accuracy]
+accuracy/test_llm_api_pytorch.py::TestDeepSeekR1LongBenchV2::test_fp8_8gpus
+accuracy/test_llm_api_pytorch.py::TestDeepSeekR1LongBenchV2::test_nvfp4_4gpus