@@ -628,6 +628,10 @@ msgid "The model is currently disabled. Please try again later."
 msgstr ""
 "Модель в настоящее время неактивна. Пожалуйста, повторите попытку позже."
 
+#: ml_model/exceptions.py:142
+msgid "Available only in paid plan"
+msgstr "Доступно только в платном тарифе"
+
 #: ml_model/exceptions.py:119
 msgid "Service is currently unavailable due to high demand. Please try again later"
 msgstr "Сервис временно недоступен из-за высокой нагрузки. Пожалуйста, попробуйте позже"
@@ -10,7 +10,7 @@ from django.utils.translation import gettext_lazy
 from langchain_core.messages import HumanMessage, SystemMessage, BaseMessage
 
 from messages.models import Message
-from ml_model.exceptions import FileExtensionNotSupported, CorruptedFileError
+from ml_model.exceptions import FileExtensionNotSupported, CorruptedFileError, PaidPlanRequiredError
 from ml_model.models import NeuronModel
 from ml_model.services import Chatgpt
 from ml_model.services.EmbeddingService import EmbeddingService
@@ -108,6 +108,8 @@ class Chatgpt_5_4(Chatgpt):
         user_system_prompt = info.pop('system_prompt', '')
         plan_info = self.store.user.payment_plan
         is_free_plan = plan_info and plan_info.plan.price <= 0
+        if is_free_plan and model_name == 'gpt-5.4-pro':
+            raise PaidPlanRequiredError()
         if is_free_plan:
             info.pop('web_search', None)
             info.pop('code_interpreter', None)
@@ -136,3 +136,8 @@ class PromptLengthExceeded(Exception):
 class ServiceHighDemandError(Exception):
     def __str__(self) -> str:
         return _('Service is currently unavailable due to high demand. Please try again later')
+
+
+class PaidPlanRequiredError(Exception):
+    def __str__(self) -> str:
+        return _('Available only in paid plan')
@@ -26,6 +26,7 @@ from ml_model.exceptions import (
     FileExtensionNotSupported,
     FileTooLargeError,
     ImageAnalysisError,
+    PaidPlanRequiredError,
     PromptLengthExceeded,
     RequestBlocked,
     TemplateNotFound,
@@ -167,6 +168,8 @@ class MessagesAPIView(APIView):
                     {'detail': f'{exc}'},
                     status=HTTP_503_SERVICE_UNAVAILABLE,
                 )
+            except PaidPlanRequiredError as exc:
+                return Response({'detail': f'{exc}'}, status=HTTP_402_PAYMENT_REQUIRED)
             except (
                 FileExtensionNotSupported,
                 ExceededContextLengthError,