diff --git a/vllm/platforms/cpu.py b/vllm/platforms/cpu.py
index cfd7bc2a4057..67466bdb9807 100644
--- a/vllm/platforms/cpu.py
+++ b/vllm/platforms/cpu.py
@@ -180,7 +180,3 @@ def get_device_communicator_cls(cls) -> str:
         Get device specific communicator class for distributed communication.
         """
         return "vllm.distributed.device_communicators.cpu_communicator.CpuCommunicator"  # noqa
-
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
diff --git a/vllm/platforms/cuda.py b/vllm/platforms/cuda.py
index 053cf74ebceb..0576022be448 100644
--- a/vllm/platforms/cuda.py
+++ b/vllm/platforms/cuda.py
@@ -308,10 +308,6 @@ def supports_fp8(cls) -> bool:
     def supports_v1(cls, model_config: ModelConfig) -> bool:
         return True
 
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
-
     @classmethod
     def use_custom_allreduce(cls) -> bool:
         return True
diff --git a/vllm/platforms/hpu.py b/vllm/platforms/hpu.py
index f011f14029a3..4c842b525110 100644
--- a/vllm/platforms/hpu.py
+++ b/vllm/platforms/hpu.py
@@ -92,7 +92,3 @@ def get_punica_wrapper(cls) -> str:
     @classmethod
     def get_device_communicator_cls(cls) -> str:
         return "vllm.distributed.device_communicators.hpu_communicator.HpuCommunicator"  # noqa
-
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
diff --git a/vllm/platforms/interface.py b/vllm/platforms/interface.py
index 2bb543bd73f7..9799d4cb2ea7 100644
--- a/vllm/platforms/interface.py
+++ b/vllm/platforms/interface.py
@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
-
 import enum
 import platform
 import random
@@ -9,14 +8,21 @@
 import numpy as np
 import torch
 
+from vllm.inputs import PromptType
 from vllm.logger import init_logger
 
 if TYPE_CHECKING:
     from vllm.config import ModelConfig, VllmConfig
+    from vllm.lora.request import LoRARequest
+    from vllm.pooling_params import PoolingParams
+    from vllm.sampling_params import SamplingParams
     from vllm.utils import FlexibleArgumentParser
 else:
     ModelConfig = None
     VllmConfig = None
+    LoRARequest = None
+    PoolingParams = None
+    SamplingParams = None
     FlexibleArgumentParser = None
 
 logger = init_logger(__name__)
@@ -379,13 +385,6 @@ def supports_v1(cls, model_config: ModelConfig) -> bool:
         """
         return False
 
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        """
-        Returns whether the current platform can support structured output.
-        """
-        return False
-
     @classmethod
     def use_custom_allreduce(cls) -> bool:
         """
@@ -393,6 +392,14 @@ def use_custom_allreduce(cls) -> bool:
         """
         return False
 
+    @classmethod
+    def validate_request(
+        cls,
+        prompt: PromptType,
+        params: Union[SamplingParams, PoolingParams],
+    ) -> None:
+        """Raises if this request is unsupported on this platform"""
+
 
 class UnspecifiedPlatform(Platform):
     _enum = PlatformEnum.UNSPECIFIED
diff --git a/vllm/platforms/neuron.py b/vllm/platforms/neuron.py
index 93657881cbdd..c1f426e5b880 100644
--- a/vllm/platforms/neuron.py
+++ b/vllm/platforms/neuron.py
@@ -67,7 +67,3 @@ def get_device_communicator_cls(cls) -> str:
     @classmethod
     def use_all_gather(cls) -> bool:
         return True
-
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
diff --git a/vllm/platforms/rocm.py b/vllm/platforms/rocm.py
index a2fbf416ecf2..d18b7c26f7ec 100644
--- a/vllm/platforms/rocm.py
+++ b/vllm/platforms/rocm.py
@@ -303,10 +303,6 @@ def supports_v1(cls, model_config: ModelConfig) -> bool:
         # V1 support on AMD gpus is experimental
         return True
 
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
-
     @classmethod
     def use_custom_allreduce(cls) -> bool:
         # We only enable custom allreduce for MI300 series
diff --git a/vllm/platforms/tpu.py b/vllm/platforms/tpu.py
index eeadb4a71e5e..d5848424b332 100644
--- a/vllm/platforms/tpu.py
+++ b/vllm/platforms/tpu.py
@@ -1,19 +1,26 @@
 # SPDX-License-Identifier: Apache-2.0
 
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING, Optional, Union
 
 import torch
 
 import vllm.envs as envs
+from vllm.inputs import PromptType
 from vllm.logger import init_logger
 
 from .interface import Platform, PlatformEnum, _Backend
 
 if TYPE_CHECKING:
     from vllm.config import ModelConfig, VllmConfig
+    from vllm.lora.request import LoRARequest
+    from vllm.pooling_params import PoolingParams
+    from vllm.sampling_params import SamplingParams
 else:
     ModelConfig = None
     VllmConfig = None
+    LoRARequest = None
+    PoolingParams = None
+    SamplingParams = None
 
 logger = init_logger(__name__)
 
@@ -135,6 +142,13 @@ def supports_v1(cls, model_config: ModelConfig) -> bool:
         return True
 
     @classmethod
-    def supports_structured_output(cls) -> bool:
-        # Structured output is not supported on TPU.
-        return False
+    def validate_request(
+        cls,
+        prompt: PromptType,
+        params: Union[SamplingParams, PoolingParams],
+    ) -> None:
+        """Raises if this request is unsupported on this platform"""
+        if isinstance(params,
+                      SamplingParams) and params.guided_decoding is not None:
+            raise ValueError("Structured output is not supported on "
+                             f"{cls.device_name}.")
diff --git a/vllm/platforms/xpu.py b/vllm/platforms/xpu.py
index c4bd639384a4..225e756cd7ce 100644
--- a/vllm/platforms/xpu.py
+++ b/vllm/platforms/xpu.py
@@ -140,7 +140,3 @@ def device_support_bf16(cls) -> bool:
     @classmethod
     def get_device_communicator_cls(cls) -> str:
         return "vllm.distributed.device_communicators.xpu_communicator.XpuCommunicator"  # noqa
-
-    @classmethod
-    def supports_structured_output(cls) -> bool:
-        return True
diff --git a/vllm/v1/engine/processor.py b/vllm/v1/engine/processor.py
index 403edddfcbee..6c1a54bca9f8 100644
--- a/vllm/v1/engine/processor.py
+++ b/vllm/v1/engine/processor.py
@@ -137,11 +137,6 @@ def _validate_structured_output(self, params: SamplingParams) -> None:
         else:
             params.guided_decoding.backend = engine_level_backend
 
-        from vllm.platforms import current_platform
-        if not current_platform.supports_structured_output():
-            raise ValueError("Structured output is not supported on "
-                             f"{current_platform.device_name}.")
-
         # Request content validation
         if engine_level_backend.startswith("xgrammar"):
             # xgrammar with no fallback
@@ -183,6 +178,11 @@ def process_inputs(
         # TODO(woosuk): Support pooling models.
         # TODO(woosuk): Support encoder-decoder models.
 
+        from vllm.platforms import current_platform
+        current_platform.validate_request(
+            prompt=prompt,
+            params=params,
+        )
         self._validate_lora(lora_request)
         self._validate_params(params)
         if priority != 0: