diff --git a/adapters/google_adapter.py b/adapters/google_adapter.py
index a4cd452..4e14f35 100644
--- a/adapters/google_adapter.py
+++ b/adapters/google_adapter.py
@@ -8,7 +8,7 @@ from google import genai
 from google.genai import types
 
 from adapters.Exception import GoogleGenerationException
-from models.enums import AspectRatios, Quality
+from models.enums import AspectRatios, Quality, TextModel, ImageModel
 
 logger = logging.getLogger(__name__)
 
@@ -19,10 +19,6 @@ class GoogleAdapter:
             raise ValueError("API Key for Gemini is missing")
         self.client = genai.Client(api_key=api_key)
 
-        # Константы моделей
-        self.TEXT_MODEL = "gemini-3.1-pro-preview"
-        self.IMAGE_MODEL = "gemini-3-pro-image-preview"
-
     def _prepare_contents(self, prompt: str, images_list: List[bytes] | None = None) -> tuple:
         """Вспомогательный метод для подготовки контента (текст + картинки).
         Returns (contents, opened_images) — caller MUST close opened_images after use."""
@@ -41,16 +37,19 @@ class GoogleAdapter:
             logger.info("Preparing content with no images")
         return contents, opened_images
 
-    def generate_text(self, prompt: str, images_list: List[bytes] | None = None) -> str:
+    def generate_text(self, prompt: str, model: str = "gemini-3.1-pro-preview", images_list: List[bytes] | None = None) -> str:
         """
         Генерация текста (Чат или Vision).
         Возвращает строку с ответом.
         """
+        if model not in [m.value for m in TextModel]:
+            raise ValueError(f"Invalid model for text generation: {model}. Expected one of: {[m.value for m in TextModel]}")
+
         contents, opened_images = self._prepare_contents(prompt, images_list)
-        logger.info(f"Generating text: {prompt}")
+        logger.info(f"Generating text: {prompt} with model: {model}")
         try:
             response = self.client.models.generate_content(
-                model=self.TEXT_MODEL,
+                model=model,
                 contents=contents,
                 config=types.GenerateContentConfig(
                     response_modalities=['TEXT'],
@@ -74,21 +73,23 @@ class GoogleAdapter:
             for img in opened_images:
                 img.close()
 
-    def generate_image(self, prompt: str, aspect_ratio: AspectRatios, quality: Quality, images_list: List[bytes] | None = None, ) -> Tuple[List[io.BytesIO], Dict[str, Any]]:
+    def generate_image(self, prompt: str, aspect_ratio: AspectRatios, quality: Quality, model: str = "gemini-3-pro-image-preview", images_list: List[bytes] | None = None, ) -> Tuple[List[io.BytesIO], Dict[str, Any]]:
         """
         Генерация изображений (Text-to-Image или Image-to-Image).
         Возвращает список байтовых потоков (готовых к отправке).
         """
+        if model not in [m.value for m in ImageModel]:
+            raise ValueError(f"Invalid model for image generation: {model}. Expected one of: {[m.value for m in ImageModel]}")
 
         contents, opened_images = self._prepare_contents(prompt, images_list)
-        logger.info(f"Generating image. Prompt length: {len(prompt)}, Ratio: {aspect_ratio}, Quality: {quality}")
+        logger.info(f"Generating image. Prompt length: {len(prompt)}, Ratio: {aspect_ratio}, Quality: {quality}, Model: {model}")
 
         start_time = datetime.now()
         token_usage = 0
         
         try:
             response = self.client.models.generate_content(
-                model=self.IMAGE_MODEL,
+                model=model,
                 contents=contents,
                 config=types.GenerateContentConfig(
                     response_modalities=['IMAGE'],
diff --git a/api/endpoints/admin.py b/api/endpoints/admin.py
index 59f89d5..1fa8ab2 100644
--- a/api/endpoints/admin.py
+++ b/api/endpoints/admin.py
@@ -1,4 +1,4 @@
-from typing import Annotated, List
+from typing import Annotated
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.security import OAuth2PasswordBearer
@@ -54,7 +54,7 @@ class UserResponse(BaseModel):
     class Config:
         from_attributes = True
 
-@router.get("/approvals", response_model=List[UserResponse])
+@router.get("/approvals", response_model=list[UserResponse])
 async def list_pending_users(
     admin: Annotated[dict, Depends(get_current_admin)],
     repo: Annotated[UsersRepo, Depends(get_users_repo)]
diff --git a/api/endpoints/album_router.py b/api/endpoints/album_router.py
index 252a619..09b4a4c 100644
--- a/api/endpoints/album_router.py
+++ b/api/endpoints/album_router.py
@@ -1,4 +1,3 @@
-from typing import List, Optional
 from fastapi import APIRouter, HTTPException, status, Request
 from pydantic import BaseModel
 
@@ -13,18 +12,18 @@ router = APIRouter(prefix="/api/albums", tags=["Albums"])
 
 class AlbumCreateRequest(BaseModel):
     name: str
-    description: Optional[str] = None
+    description: str | None = None
 
 class AlbumUpdateRequest(BaseModel):
-    name: Optional[str] = None
-    description: Optional[str] = None
+    name: str | None = None
+    description: str | None = None
 
 class AlbumResponse(BaseModel):
     id: str
     name: str
-    description: Optional[str] = None
-    generation_ids: List[str] = []
-    cover_asset_id: Optional[str] = None # Not implemented yet
+    description: str | None = None
+    generation_ids: list[str] = []
+    cover_asset_id: str | None = None # Not implemented yet
 
 @router.post("", response_model=AlbumResponse)
 async def create_album(request: Request, album_in: AlbumCreateRequest):
@@ -32,7 +31,7 @@ async def create_album(request: Request, album_in: AlbumCreateRequest):
     album = await service.create_album(name=album_in.name, description=album_in.description)
     return AlbumResponse(**album.model_dump())
 
-@router.get("", response_model=List[AlbumResponse])
+@router.get("", response_model=list[AlbumResponse])
 async def get_albums(request: Request, limit: int = 10, offset: int = 0):
     service: AlbumService = request.app.state.album_service
     albums = await service.get_albums(limit=limit, offset=offset)
@@ -77,7 +76,7 @@ async def remove_generation_from_album(request: Request, album_id: str, generati
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Album or Generation not found")
     return {"status": "success"}
 
-@router.get("/{album_id}/generations", response_model=List[GenerationResponse])
+@router.get("/{album_id}/generations", response_model=list[GenerationResponse])
 async def get_album_generations(request: Request, album_id: str, limit: int = 10, offset: int = 0):
     service: AlbumService = request.app.state.album_service
     generations = await service.get_generations_by_album(album_id, limit=limit, offset=offset)
diff --git a/api/endpoints/assets_router.py b/api/endpoints/assets_router.py
index a1073c9..87172d0 100644
--- a/api/endpoints/assets_router.py
+++ b/api/endpoints/assets_router.py
@@ -1,4 +1,4 @@
-from typing import List, Optional, Dict, Any
+from typing import Any
 
 from aiogram.types import BufferedInputFile
 from bson import ObjectId
@@ -135,22 +135,22 @@ async def delete_orphan_assets_from_minio(
     *,
     assets_collection: str = "assets",
     generations_collection: str = "generations",
-    asset_type: Optional[str] = "generated",
-    project_id: Optional[str] = None,
+    asset_type: str | None = "generated",
+    project_id: str | None = None,
     dry_run: bool = True,
     mark_assets_deleted: bool = False,
     batch_size: int = 500,
-) -> Dict[str, Any]:
+) -> dict[str, Any]:
     db = mongo['bot_db']  # БД уже выбрана в get_mongo_client
     assets = db[assets_collection]
 
-    match_assets: Dict[str, Any] = {}
+    match_assets: dict[str, Any] = {}
     if asset_type is not None:
         match_assets["type"] = asset_type
     if project_id is not None:
         match_assets["project_id"] = project_id
 
-    pipeline: List[Dict[str, Any]] = [
+    pipeline: list[dict[str, Any]] = [
         {"$match": match_assets} if match_assets else {"$match": {}},
         {
             "$lookup": {
@@ -192,8 +192,8 @@ async def delete_orphan_assets_from_minio(
 
     deleted_objects = 0
     deleted_assets = 0
-    errors: List[Dict[str, Any]] = []
-    orphan_asset_ids: List[ObjectId] = []
+    errors: list[dict[str, Any]] = []
+    orphan_asset_ids: list[ObjectId] = []
 
     async for asset in cursor:
         aid = asset["_id"]
@@ -259,7 +259,7 @@ async def delete_asset(
 
 
 @router.get("", dependencies=[Depends(get_current_user)])
-async def get_assets(request: Request, dao: DAO = Depends(get_dao), type: Optional[str] = None, limit: int = 10, offset: int = 0, current_user: dict = Depends(get_current_user), project_id: Optional[str] = Depends(get_project_id)) -> AssetsResponse:
+async def get_assets(request: Request, dao: DAO = Depends(get_dao), type: str | None = None, limit: int = 10, offset: int = 0, current_user: dict = Depends(get_current_user), project_id: str | None = Depends(get_project_id)) -> AssetsResponse:
     logger.info(f"get_assets called. Limit: {limit}, Offset: {offset}")
     
     user_id_filter = current_user["id"]
@@ -286,10 +286,10 @@ async def get_assets(request: Request, dao: DAO = Depends(get_dao), type: Option
 @router.post("/upload", response_model=AssetResponse, status_code=status.HTTP_201_CREATED)
 async def upload_asset(
     file: UploadFile = File(...),
-    linked_char_id: Optional[str] = Form(None),
+    linked_char_id: str | None = Form(None),
     dao: DAO = Depends(get_dao),
     current_user: dict = Depends(get_current_user),
-    project_id: Optional[str] = Depends(get_project_id)
+    project_id: str | None = Depends(get_project_id)
 ):
     logger.info(f"upload_asset called. Filename: {file.filename}, ContentType: {file.content_type}, LinkedCharId: {linked_char_id}")
     if not file.content_type:
diff --git a/api/endpoints/character_router.py b/api/endpoints/character_router.py
index 67d0c07..fe47b2a 100644
--- a/api/endpoints/character_router.py
+++ b/api/endpoints/character_router.py
@@ -1,4 +1,4 @@
-from typing import List, Any, Coroutine, Optional
+from typing import Any, Coroutine
 
 from fastapi import APIRouter, Depends
 from pydantic import BaseModel
@@ -23,15 +23,15 @@ from api.dependency import get_project_id
 router = APIRouter(prefix="/api/characters", tags=["Characters"], dependencies=[Depends(get_current_user)])
 
 
-@router.get("/", response_model=List[Character])
+@router.get("/", response_model=list[Character])
 async def get_characters(
     request: Request, 
     dao: DAO = Depends(get_dao), 
     current_user: dict = Depends(get_current_user), 
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     limit: int = 100,
     offset: int = 0
-) -> List[Character]:
+) -> list[Character]:
     logger.info(f"get_characters called. Limit: {limit}, Offset: {offset}")
     
     user_id_filter = str(current_user["_id"])
@@ -102,7 +102,7 @@ async def get_character_by_id(character_id: str, request: Request, dao: DAO = De
 @router.post("/", response_model=Character)
 async def create_character(
     char_req: CharacterCreateRequest,
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     dao: DAO = Depends(get_dao),
     current_user: dict = Depends(get_current_user)
 ) -> Character:
diff --git a/api/endpoints/environment_router.py b/api/endpoints/environment_router.py
index 3b1f6b0..56caac6 100644
--- a/api/endpoints/environment_router.py
+++ b/api/endpoints/environment_router.py
@@ -1,5 +1,4 @@
 import logging
-from typing import List, Optional
 from fastapi import APIRouter, Depends, HTTPException
 from starlette import status
 
@@ -50,7 +49,7 @@ async def create_environment(
     return created_env
 
 
-@router.get("/character/{character_id}", response_model=List[Environment])
+@router.get("/character/{character_id}", response_model=list[Environment])
 async def get_character_environments(
     character_id: str,
     dao: DAO = Depends(get_dao),
diff --git a/api/endpoints/generation_router.py b/api/endpoints/generation_router.py
index 641ef70..b7725a9 100644
--- a/api/endpoints/generation_router.py
+++ b/api/endpoints/generation_router.py
@@ -1,6 +1,5 @@
 import logging
 import json
-from typing import List, Optional
 
 from fastapi import APIRouter, UploadFile, File, Form, Header, HTTPException
 from fastapi.params import Depends
@@ -30,7 +29,7 @@ logger = logging.getLogger(__name__)
 router = APIRouter(prefix='/api/generations', tags=["Generation"])
 
 
-async def check_project_access(project_id: Optional[str], current_user: dict, dao: DAO):
+async def check_project_access(project_id: str | None, current_user: dict, dao: DAO):
     """Helper to check if user has access to project."""
     if not project_id:
         return
@@ -46,31 +45,36 @@ async def ask_prompt_assistant(
         current_user: dict = Depends(get_current_user)
 ) -> PromptResponse:
     logger.info(f"ask_prompt_assistant: {len(prompt_request.prompt)} chars")
-    generated_prompt = await generation_service.ask_prompt_assistant(prompt_request.prompt, prompt_request.linked_assets)
+    generated_prompt = await generation_service.ask_prompt_assistant(
+        prompt_request.prompt, 
+        prompt_request.linked_assets,
+        prompt_request.model
+    )
     return PromptResponse(prompt=generated_prompt)
 
 
 @router.post("/prompt-from-image", response_model=PromptResponse)
 async def prompt_from_image(
-        prompt: Optional[str] = Form(None),
-        images: List[UploadFile] = File(...),
+        prompt: str | None = Form(None),
+        model: str = Form("gemini-3.1-pro-preview"),
+        images: list[UploadFile] = File(...),
         generation_service: GenerationService = Depends(get_generation_service),
         current_user: dict = Depends(get_current_user)
 ) -> PromptResponse:
     images_bytes = [await img.read() for img in images]
-    generated_prompt = await generation_service.generate_prompt_from_images(images_bytes, prompt)
+    generated_prompt = await generation_service.generate_prompt_from_images(images_bytes, prompt, model)
     return PromptResponse(prompt=generated_prompt)
 
 
 @router.get("", response_model=GenerationsResponse)
 async def get_generations(
-        character_id: Optional[str] = None, 
+        character_id: str | None = None, 
         limit: int = 10, 
         offset: int = 0,
         only_liked: bool = False,
         generation_service: GenerationService = Depends(get_generation_service),
         current_user: dict = Depends(get_current_user),
-        project_id: Optional[str] = Depends(get_project_id),
+        project_id: str | None = Depends(get_project_id),
         dao: DAO = Depends(get_dao)
 ):
     await check_project_access(project_id, current_user, dao)
@@ -92,10 +96,10 @@ async def get_generations(
 
 @router.get("/usage", response_model=FinancialReport)
 async def get_usage_report(
-    breakdown: Optional[str] = None, # "user" or "project"
+    breakdown: str | None = None, # "user" or "project"
     generation_service: GenerationService = Depends(get_generation_service),
     current_user: dict = Depends(get_current_user),
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     dao: DAO = Depends(get_dao)
 ) -> FinancialReport:
     await check_project_access(project_id, current_user, dao)
@@ -120,7 +124,7 @@ async def post_generation(
         generation: GenerationRequest, 
         generation_service: GenerationService = Depends(get_generation_service),
         current_user: dict = Depends(get_current_user),
-        project_id: Optional[str] = Depends(get_project_id),
+        project_id: str | None = Depends(get_project_id),
         dao: DAO = Depends(get_dao)
 ) -> GenerationGroupResponse:
     await check_project_access(project_id, current_user, dao)
@@ -137,7 +141,7 @@ async def post_generation(
 async def get_running_generations(
         generation_service: GenerationService = Depends(get_generation_service),
         current_user: dict = Depends(get_current_user),
-        project_id: Optional[str] = Depends(get_project_id),
+        project_id: str | None = Depends(get_project_id),
         dao: DAO = Depends(get_dao)
 ):
     await check_project_access(project_id, current_user, dao)
diff --git a/api/endpoints/idea_router.py b/api/endpoints/idea_router.py
index 7003fa1..137f55b 100644
--- a/api/endpoints/idea_router.py
+++ b/api/endpoints/idea_router.py
@@ -1,4 +1,3 @@
-from typing import List, Optional
 from fastapi import APIRouter, Depends, HTTPException, Query, Body
 from api.dependency import get_idea_service, get_project_id, get_generation_service
 from api.endpoints.auth import get_current_user
@@ -14,7 +13,7 @@ router = APIRouter(prefix="/api/ideas", tags=["ideas"])
 @router.post("", response_model=Idea)
 async def create_idea(
     request: IdeaCreateRequest,
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     current_user: dict = Depends(get_current_user),
     idea_service: IdeaService = Depends(get_idea_service)
 ):
@@ -28,9 +27,9 @@ async def create_idea(
         inspiration_id=request.inspiration_id
     )
 
-@router.get("", response_model=List[IdeaResponse])
+@router.get("", response_model=list[IdeaResponse])
 async def get_ideas(
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     limit: int = 20,
     offset: int = 0,
     current_user: dict = Depends(get_current_user),
diff --git a/api/endpoints/inspiration_router.py b/api/endpoints/inspiration_router.py
index e942016..e32ecba 100644
--- a/api/endpoints/inspiration_router.py
+++ b/api/endpoints/inspiration_router.py
@@ -1,4 +1,3 @@
-from typing import List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from api.dependency import get_inspiration_service, get_project_id
@@ -13,7 +12,7 @@ router = APIRouter(prefix="/api/inspirations", tags=["Inspirations"])
 @router.post("", response_model=InspirationResponse, status_code=status.HTTP_201_CREATED)
 async def create_inspiration(
     request: InspirationCreateRequest,
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     current_user: dict = Depends(get_current_user),
     service: InspirationService = Depends(get_inspiration_service)
 ):
@@ -30,7 +29,7 @@ async def create_inspiration(
 
 @router.get("", response_model=InspirationListResponse)
 async def get_inspirations(
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     limit: int = 20,
     offset: int = 0,
     current_user: dict = Depends(get_current_user),
diff --git a/api/endpoints/post_router.py b/api/endpoints/post_router.py
index a9f3353..407bcff 100644
--- a/api/endpoints/post_router.py
+++ b/api/endpoints/post_router.py
@@ -1,4 +1,3 @@
-from typing import List, Optional
 from datetime import datetime
 from fastapi import APIRouter, Depends, HTTPException
 
@@ -14,7 +13,7 @@ router = APIRouter(prefix="/api/posts", tags=["posts"])
 @router.post("", response_model=Post)
 async def create_post(
     request: PostCreateRequest,
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     current_user: dict = Depends(get_current_user),
     post_service: PostService = Depends(get_post_service),
 ):
@@ -28,13 +27,13 @@ async def create_post(
     )
 
 
-@router.get("", response_model=List[Post])
+@router.get("", response_model=list[Post])
 async def get_posts(
-    project_id: Optional[str] = Depends(get_project_id),
+    project_id: str | None = Depends(get_project_id),
     limit: int = 200,
     offset: int = 0,
-    date_from: Optional[datetime] = None,
-    date_to: Optional[datetime] = None,
+    date_from: datetime | None = None,
+    date_to: datetime | None = None,
     current_user: dict = Depends(get_current_user),
     post_service: PostService = Depends(get_post_service),
 ):
diff --git a/api/endpoints/project_router.py b/api/endpoints/project_router.py
index 96375f9..1aa7635 100644
--- a/api/endpoints/project_router.py
+++ b/api/endpoints/project_router.py
@@ -1,4 +1,3 @@
-from typing import List, Optional
 
 from bson import ObjectId
 from fastapi import APIRouter, Depends, HTTPException, status
@@ -12,7 +11,7 @@ router = APIRouter(prefix="/api/projects", tags=["Projects"])
 
 class ProjectCreate(BaseModel):
     name: str
-    description: Optional[str] = None
+    description: str | None = None
 
 class ProjectMemberResponse(BaseModel):
     id: str
@@ -21,9 +20,9 @@ class ProjectMemberResponse(BaseModel):
 class ProjectResponse(BaseModel):
     id: str
     name: str
-    description: Optional[str] = None
+    description: str | None = None
     owner_id: str
-    members: List[ProjectMemberResponse]
+    members: list[ProjectMemberResponse]
     is_owner: bool = False
 
 async def _get_project_response(project: Project, current_user_id: str, dao: DAO) -> ProjectResponse:
@@ -78,7 +77,7 @@ async def create_project(
 
     return await _get_project_response(new_project, user_id, dao)
 
-@router.get("", response_model=List[ProjectResponse])
+@router.get("", response_model=list[ProjectResponse])
 async def get_my_projects(
     dao: DAO = Depends(get_dao),
     current_user: dict = Depends(get_current_user)
diff --git a/api/models/AssetDTO.py b/api/models/AssetDTO.py
index 8d46977..fa544d5 100644
--- a/api/models/AssetDTO.py
+++ b/api/models/AssetDTO.py
@@ -1,5 +1,4 @@
 from datetime import datetime
-from typing import List, Optional
 
 from pydantic import BaseModel
 
@@ -11,10 +10,10 @@ class AssetResponse(BaseModel):
     name: str
     type: str # uploaded / generated
     content_type: str # image / prompt
-    linked_char_id: Optional[str] = None
+    linked_char_id: str | None = None
     created_at: datetime
-    url: Optional[str] = None
+    url: str | None = None
 
 class AssetsResponse(BaseModel):
-    assets: List[AssetResponse]
+    assets: list[AssetResponse]
     total_count: int
\ No newline at end of file
diff --git a/api/models/CharacterDTO.py b/api/models/CharacterDTO.py
index ca73053..4cdb4d4 100644
--- a/api/models/CharacterDTO.py
+++ b/api/models/CharacterDTO.py
@@ -1,18 +1,17 @@
-from typing import Optional
 from pydantic import BaseModel
 
 class CharacterCreateRequest(BaseModel):
     name: str
     character_bio: str
-    character_image_doc_tg_id: Optional[str] = None
-    avatar_image: Optional[str] = None
-    character_image_tg_id: Optional[str] = None
-    project_id: Optional[str] = None
+    character_image_doc_tg_id: str | None = None
+    avatar_image: str | None = None
+    character_image_tg_id: str | None = None
+    project_id: str | None = None
 
 class CharacterUpdateRequest(BaseModel):
-    name: Optional[str] = None
-    character_bio: Optional[str] = None
-    character_image_doc_tg_id: Optional[str] = None
-    avatar_image: Optional[str] = None
-    character_image_tg_id: Optional[str] = None
-    project_id: Optional[str] = None
+    name: str | None = None
+    character_bio: str | None = None
+    character_image_doc_tg_id: str | None = None
+    avatar_image: str | None = None
+    character_image_tg_id: str | None = None
+    project_id: str | None = None
diff --git a/api/models/EnvironmentRequest.py b/api/models/EnvironmentRequest.py
index 430bc0a..bb12418 100644
--- a/api/models/EnvironmentRequest.py
+++ b/api/models/EnvironmentRequest.py
@@ -1,18 +1,17 @@
-from typing import Optional, List
 from pydantic import BaseModel, Field
 
 
 class EnvironmentCreate(BaseModel):
     character_id: str
     name: str = Field(..., min_length=1)
-    description: Optional[str] = None
-    asset_ids: Optional[List[str]] = []
+    description: str | None = None
+    asset_ids: list[str] | None = []
 
 
 class EnvironmentUpdate(BaseModel):
-    name: Optional[str] = Field(None, min_length=1)
-    description: Optional[str] = None
-    asset_ids: Optional[List[str]] = None
+    name: str | None = Field(None, min_length=1)
+    description: str | None = None
+    asset_ids: list[str] | None = None
 
 
 class AssetToEnvironment(BaseModel):
@@ -20,4 +19,4 @@ class AssetToEnvironment(BaseModel):
 
 
 class AssetsToEnvironment(BaseModel):
-    asset_ids: List[str]
+    asset_ids: list[str]
diff --git a/api/models/ExternalGenerationDTO.py b/api/models/ExternalGenerationDTO.py
index 4744015..5b3feb0 100644
--- a/api/models/ExternalGenerationDTO.py
+++ b/api/models/ExternalGenerationDTO.py
@@ -1,4 +1,3 @@
-from typing import Optional
 from pydantic import BaseModel, Field
 from models.enums import AspectRatios, Quality
 
@@ -7,29 +6,31 @@ class ExternalGenerationRequest(BaseModel):
     """Request model for importing external generations."""
     
     prompt: str
-    tech_prompt: Optional[str] = None
+    tech_prompt: str | None = None
     
     # Image can be provided as base64 string OR URL (one must be provided)
-    image_data: Optional[str] = Field(None, description="Base64-encoded image data")
-    image_url: Optional[str] = Field(None, description="URL to download image from")
+    image_data: str | None = Field(None, description="Base64-encoded image data")
+    image_url: str | None = Field(None, description="URL to download image from")
 
     nsfw: bool = False
 
     # Generation metadata
     aspect_ratio: AspectRatios = AspectRatios.NINESIXTEEN  # "1:1","2:3","3:2","3:4","4:3","4:5","5:4","9:16","16:9","21:9"
     quality: Quality = Quality.ONEK
+    model: str | None = None
+    seed: int | None = None
     
     # Optional linking
-    linked_character_id: Optional[str] = None
+    linked_character_id: str | None = None
     created_by: str = Field(..., description="User ID from external system")
-    project_id: Optional[str] = None
+    project_id: str | None = None
     
     # Performance metrics
-    execution_time_seconds: Optional[float] = None
-    api_execution_time_seconds: Optional[float] = None
-    token_usage: Optional[int] = None
-    input_token_usage: Optional[int] = None
-    output_token_usage: Optional[int] = None
+    execution_time_seconds: float | None = None
+    api_execution_time_seconds: float | None = None
+    token_usage: int | None = None
+    input_token_usage: int | None = None
+    output_token_usage: int | None = None
     
     def validate_image_source(self):
         """Ensure at least one image source is provided."""
diff --git a/api/models/FinancialUsageDTO.py b/api/models/FinancialUsageDTO.py
index 90f1afd..fd163a9 100644
--- a/api/models/FinancialUsageDTO.py
+++ b/api/models/FinancialUsageDTO.py
@@ -1,5 +1,4 @@
 from pydantic import BaseModel
-from typing import List, Optional
 
 class UsageStats(BaseModel):
     total_runs: int
@@ -9,10 +8,10 @@ class UsageStats(BaseModel):
     total_cost: float
 
 class UsageByEntity(BaseModel):
-    entity_id: Optional[str] = None
+    entity_id: str | None = None
     stats: UsageStats
 
 class FinancialReport(BaseModel):
     summary: UsageStats
-    by_user: Optional[List[UsageByEntity]] = None
-    by_project: Optional[List[UsageByEntity]] = None
+    by_user: list[UsageByEntity] | None = None
+    by_project: list[UsageByEntity] | None = None
diff --git a/api/models/GenerationRequest.py b/api/models/GenerationRequest.py
index e24d9c0..6f2713f 100644
--- a/api/models/GenerationRequest.py
+++ b/api/models/GenerationRequest.py
@@ -1,24 +1,24 @@
 from datetime import datetime, UTC
-from typing import List, Optional
 
 from pydantic import BaseModel, Field
 
 from models.Asset import Asset
 from models.Generation import GenerationStatus
-from models.enums import AspectRatios, Quality, GenType
+from models.enums import AspectRatios, Quality, GenType, ImageModel, TextModel
 
 
 class GenerationRequest(BaseModel):
-    linked_character_id: Optional[str] = None
+    linked_character_id: str | None = None
     aspect_ratio: AspectRatios = AspectRatios.NINESIXTEEN  # "1:1","2:3","3:2","3:4","4:3","4:5","5:4","9:16","16:9","21:9"
     quality: Quality = Quality.ONEK
     prompt: str
-    telegram_id: Optional[int] = None
+    model: ImageModel = Field(default=ImageModel.GEMINI_3_PRO_IMAGE_PREVIEW)
+    telegram_id: int | None = None
     use_profile_image: bool = True
-    assets_list: List[str]
-    environment_id: Optional[str] = None
-    project_id: Optional[str] = None
-    idea_id: Optional[str] = None
+    assets_list: list[str]
+    environment_id: str | None = None
+    project_id: str | None = None
+    idea_id: str | None = None
     nsfw: bool = False
     count: int = Field(default=1, ge=1, le=10)
 
@@ -28,33 +28,35 @@ class NsfwRequest(BaseModel):
 
 
 class GenerationsResponse(BaseModel):
-    generations: List["GenerationResponse"]
+    generations: list["GenerationResponse"]
     total_count: int
 
 
 class GenerationResponse(BaseModel):
     id: str
     status: GenerationStatus
-    failed_reason: Optional[str] = None
+    failed_reason: str | None = None
     project_id: str | None = None
-    linked_character_id: Optional[str] = None
+    linked_character_id: str | None = None
     aspect_ratio: AspectRatios
     quality: Quality
     prompt: str
-    tech_prompt: Optional[str] = None
-    assets_list: List[str]
-    result_list: List[str] = []
-    result: Optional[str] = None
-    execution_time_seconds: Optional[float] = None
-    api_execution_time_seconds: Optional[float] = None
-    token_usage: Optional[int] = None
-    input_token_usage: Optional[int] = None
-    output_token_usage: Optional[int] = None
+    model: ImageModel | None = None
+    seed: int | None = None
+    tech_prompt: str | None = None
+    assets_list: list[str]
+    result_list: list[str] = []
+    result: str | None = None
+    execution_time_seconds: float | None = None
+    api_execution_time_seconds: float | None = None
+    token_usage: int | None = None
+    input_token_usage: int | None = None
+    output_token_usage: int | None = None
     progress: int = 0
-    cost: Optional[float] = None
-    created_by: Optional[str] = None
-    generation_group_id: Optional[str] = None
-    idea_id: Optional[str] = None
+    cost: float | None = None
+    created_by: str | None = None
+    generation_group_id: str | None = None
+    idea_id: str | None = None
     likes_count: int = 0
     is_liked: bool = False
     nsfw: bool = False
@@ -64,12 +66,13 @@ class GenerationResponse(BaseModel):
 
 class GenerationGroupResponse(BaseModel):
     generation_group_id: str
-    generations: List[GenerationResponse]
+    generations: list[GenerationResponse]
 
 
 class PromptRequest(BaseModel):
     prompt: str
-    linked_assets: List[str] = []
+    model: TextModel = Field(default=TextModel.GEMINI_3_1_PRO_PREVIEW)
+    linked_assets: list[str] = []
 
 
 class PromptResponse(BaseModel):
diff --git a/api/models/IdeaRequest.py b/api/models/IdeaRequest.py
index 327adbb..436b679 100644
--- a/api/models/IdeaRequest.py
+++ b/api/models/IdeaRequest.py
@@ -1,18 +1,17 @@
-from typing import Optional
 from pydantic import BaseModel
 from models.Idea import Idea
 from api.models.GenerationRequest import GenerationResponse
 
 class IdeaCreateRequest(BaseModel):
     name: str
-    description: Optional[str] = None
-    project_id: Optional[str] = None # Optional in body if passed via header/dependency
-    inspiration_id: Optional[str] = None
+    description: str | None = None
+    project_id: str | None = None # Optional in body if passed via header/dependency
+    inspiration_id: str | None = None
 
 class IdeaUpdateRequest(BaseModel):
-    name: Optional[str] = None
-    description: Optional[str] = None
-    inspiration_id: Optional[str] = None
+    name: str | None = None
+    description: str | None = None
+    inspiration_id: str | None = None
 
 class IdeaResponse(Idea):
-    last_generation: Optional[GenerationResponse] = None
+    last_generation: GenerationResponse | None = None
diff --git a/api/models/InspirationRequest.py b/api/models/InspirationRequest.py
index 802dc3b..3e26417 100644
--- a/api/models/InspirationRequest.py
+++ b/api/models/InspirationRequest.py
@@ -1,5 +1,4 @@
 from datetime import datetime
-from typing import List, Optional
 
 from pydantic import BaseModel
 
@@ -8,8 +7,8 @@ from models.Inspiration import Inspiration
 
 class InspirationCreateRequest(BaseModel):
     source_url: str
-    caption: Optional[str] = None
-    project_id: Optional[str] = None
+    caption: str | None = None
+    project_id: str | None = None
 
 
 class InspirationResponse(BaseModel):
@@ -25,5 +24,5 @@ class InspirationResponse(BaseModel):
 
 
 class InspirationListResponse(BaseModel):
-    inspirations: List[InspirationResponse]
+    inspirations: list[InspirationResponse]
     total_count: int
diff --git a/api/models/PostRequest.py b/api/models/PostRequest.py
index 18be225..7eb5cc4 100644
--- a/api/models/PostRequest.py
+++ b/api/models/PostRequest.py
@@ -1,19 +1,18 @@
 from datetime import datetime
-from typing import Optional, List
 from pydantic import BaseModel
 
 
 class PostCreateRequest(BaseModel):
     date: datetime
     topic: str
-    generation_ids: List[str] = []
-    project_id: Optional[str] = None
+    generation_ids: list[str] = []
+    project_id: str | None = None
 
 
 class PostUpdateRequest(BaseModel):
-    date: Optional[datetime] = None
-    topic: Optional[str] = None
+    date: datetime | None = None
+    topic: str | None = None
 
 
 class AddGenerationsRequest(BaseModel):
-    generation_ids: List[str]
+    generation_ids: list[str]
diff --git a/api/service/generation_service.py b/api/service/generation_service.py
index 819bc53..c0c1841 100644
--- a/api/service/generation_service.py
+++ b/api/service/generation_service.py
@@ -34,6 +34,7 @@ async def generate_image_task(
         media_group_bytes: List[bytes],
         aspect_ratio: AspectRatios,
         quality: Quality,
+        model: str,
         gemini: GoogleAdapter,
 ) -> Tuple[List[bytes], Dict[str, Any]]:
     """
@@ -47,6 +48,7 @@ async def generate_image_task(
             images_list=media_group_bytes,
             aspect_ratio=aspect_ratio,
             quality=quality,
+            model=model,
         )
         generated_images_io, metrics = result
         logger.info(f"generate_image_task completed, received {len(generated_images_io) if generated_images_io else 0} images")
@@ -75,7 +77,7 @@ class GenerationService:
 
     # --- Public API ---
 
-    async def ask_prompt_assistant(self, prompt: str, assets: list[str] | None = None) -> str:
+    async def ask_prompt_assistant(self, prompt: str, assets: list[str] | None = None, model: str = "gemini-3.1-pro-preview") -> str:
         future_prompt = (
             "You are an prompt-assistant. You improving user-entered prompts for image generation. "
             "User may upload reference image too. I will provide sources prompt entered by user. "
@@ -87,17 +89,17 @@ class GenerationService:
             assets_db = await self.dao.assets.get_assets_by_ids(assets)
             assets_data.extend(asset.data for asset in assets_db if asset.data)
 
-        generated_prompt = await asyncio.to_thread(self.gemini.generate_text, future_prompt, assets_data)
+        generated_prompt = await asyncio.to_thread(self.gemini.generate_text, future_prompt, model, assets_data)
         logger.info(f"Prompt Assistant: {generated_prompt}")
         return generated_prompt
 
-    async def generate_prompt_from_images(self, images: List[bytes], user_prompt: Optional[str] = None) -> str:
+    async def generate_prompt_from_images(self, images: List[bytes], user_prompt: Optional[str] = None, model: str = "gemini-3.1-pro-preview") -> str:
         technical_prompt = "You are a prompt engineer. Describe this image in detail to create a stable diffusion using this image as reference. "
         if user_prompt:
             technical_prompt += f"User also provided this context: {user_prompt}. "
         technical_prompt += "Provide ONLY the detailed prompt."
 
-        return await asyncio.to_thread(self.gemini.generate_text, prompt=technical_prompt, images_list=images)
+        return await asyncio.to_thread(self.gemini.generate_text, prompt=technical_prompt, model=model, images_list=images)
 
     async def get_generations(self, **kwargs) -> GenerationsResponse:
         current_user_id = kwargs.pop('current_user_id', None)
@@ -162,6 +164,7 @@ class GenerationService:
                 media_group_bytes=media_group_bytes,
                 aspect_ratio=generation.aspect_ratio,
                 quality=generation.quality,
+                model=generation.model or "gemini-3-pro-image-preview",
                 gemini=self.gemini
             )
             self._update_generation_metrics(generation, metrics)
@@ -205,7 +208,9 @@ class GenerationService:
             aspect_ratio=external_gen.aspect_ratio,
             quality=external_gen.quality,
             prompt=external_gen.prompt,
+            model=external_gen.model,
             tech_prompt=external_gen.tech_prompt,
+            seed=external_gen.seed,
             result_list=[new_asset.id],
             result=new_asset.id,
             progress=100,
diff --git a/models/Album.py b/models/Album.py
index 26e6b18..b3bae59 100644
--- a/models/Album.py
+++ b/models/Album.py
@@ -1,12 +1,11 @@
 from datetime import datetime, UTC
-from typing import Optional, List
 from pydantic import BaseModel, Field
 
 class Album(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     name: str
-    description: Optional[str] = None
-    cover_asset_id: Optional[str] = None
-    generation_ids: List[str] = []
+    description: str | None = None
+    cover_asset_id: str | None = None
+    generation_ids: list[str] = []
     created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
     updated_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
diff --git a/models/Asset.py b/models/Asset.py
index 29ab56e..496e24b 100644
--- a/models/Asset.py
+++ b/models/Asset.py
@@ -1,6 +1,6 @@
 from datetime import datetime, UTC
 from enum import Enum
-from typing import Optional, Any, List
+from typing import Any
 
 from pydantic import BaseModel, computed_field, Field, model_validator
 
@@ -17,21 +17,21 @@ class AssetType(str, Enum):
 
 
 class Asset(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     name: str
     type: AssetType = AssetType.GENERATED
     content_type: AssetContentType = AssetContentType.IMAGE
-    linked_char_id: Optional[str] = None
-    data: Optional[bytes] = None
-    tg_doc_file_id: Optional[str] = None
-    tg_photo_file_id: Optional[str] = None
-    minio_object_name: Optional[str] = None
-    minio_bucket: Optional[str] = None
-    minio_thumbnail_object_name: Optional[str] = None
-    thumbnail: Optional[bytes] = None
-    tags: List[str] = []
-    created_by: Optional[str] = None
-    project_id: Optional[str] = None
+    linked_char_id: str | None = None
+    data: bytes | None = None
+    tg_doc_file_id: str | None = None
+    tg_photo_file_id: str | None = None
+    minio_object_name: str | None = None
+    minio_bucket: str | None = None
+    minio_thumbnail_object_name: str | None = None
+    thumbnail: bytes | None = None
+    tags: list[str] = []
+    created_by: str | None = None
+    project_id: str | None = None
     is_deleted: bool = False
     created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
     updated_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
diff --git a/models/Character.py b/models/Character.py
index f174659..d1fdc8c 100644
--- a/models/Character.py
+++ b/models/Character.py
@@ -1,16 +1,15 @@
-from typing import Optional
 
 from pydantic import BaseModel
 from pydantic_core.core_schema import computed_field
 
 
 class Character(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     name: str
-    avatar_asset_id: Optional[str] = None
-    avatar_image: Optional[str] = None
-    character_image_doc_tg_id: Optional[str] = None
-    character_image_tg_id: Optional[str] = None
-    character_bio: Optional[str] = None
-    created_by: Optional[str] = None
-    project_id: Optional[str] = None
+    avatar_asset_id: str | None = None
+    avatar_image: str | None = None
+    character_image_doc_tg_id: str | None = None
+    character_image_tg_id: str | None = None
+    character_bio: str | None = None
+    created_by: str | None = None
+    project_id: str | None = None
diff --git a/models/Environment.py b/models/Environment.py
index 0b1e3f1..21ffb63 100644
--- a/models/Environment.py
+++ b/models/Environment.py
@@ -1,15 +1,14 @@
-from typing import List, Optional
 from pydantic import BaseModel, Field, ConfigDict
 from datetime import datetime
 from bson import ObjectId
 
 
 class Environment(BaseModel):
-    id: Optional[str] = Field(None, alias="_id")
+    id: str | None = Field(None, alias="_id")
     character_id: str
     name: str = Field(..., min_length=1)
-    description: Optional[str] = None
-    asset_ids: List[str] = Field(default_factory=list)
+    description: str | None = None
+    asset_ids: list[str] = Field(default_factory=list)
     created_at: datetime = Field(default_factory=datetime.utcnow)
     updated_at: datetime = Field(default_factory=datetime.utcnow)
 
diff --git a/models/Generation.py b/models/Generation.py
index e3d2b70..51ef27a 100644
--- a/models/Generation.py
+++ b/models/Generation.py
@@ -1,11 +1,9 @@
 from datetime import datetime, UTC
 from enum import Enum
-from typing import List, Optional
 
 from pydantic import BaseModel, Field, computed_field
 
-from models.Asset import Asset
-from models.enums import AspectRatios, Quality, GenType
+from models.enums import AspectRatios, Quality
 
 
 class GenerationStatus(str, Enum):
@@ -14,33 +12,35 @@ class GenerationStatus(str, Enum):
     FAILED = "failed"
 
 class Generation(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     status: GenerationStatus = GenerationStatus.RUNNING
-    failed_reason: Optional[str] = None
-    linked_character_id: Optional[str] = None
-    telegram_id: Optional[int] = None
+    failed_reason: str | None = None
+    linked_character_id: str | None = None
+    telegram_id: int | None = None
     use_profile_image: bool = True
     aspect_ratio: AspectRatios
     quality: Quality
     prompt: str
-    tech_prompt: Optional[str] = None
-    assets_list: List[str] = Field(default_factory=list)
-    result_list: List[str] = Field(default_factory=list)
-    result: Optional[str] = None
+    model: str | None = None
+    seed: int | None = None
+    tech_prompt: str | None = None
+    assets_list: list[str] = Field(default_factory=list)
+    result_list: list[str] = Field(default_factory=list)
+    result: str | None = None
     progress: int = 0
-    execution_time_seconds: Optional[float] = None
-    api_execution_time_seconds: Optional[float] = None
-    token_usage: Optional[int] = None
-    input_token_usage: Optional[int] = None
-    output_token_usage: Optional[int] = None
+    execution_time_seconds: float | None = None
+    api_execution_time_seconds: float | None = None
+    token_usage: int | None = None
+    input_token_usage: int | None = None
+    output_token_usage: int | None = None
     is_deleted: bool = False
-    album_id: Optional[str] = None  
-    environment_id: Optional[str] = None
-    generation_group_id: Optional[str] = None
-    created_by: Optional[str] = None  # Stores User ID (Telegram ID or Web User ObjectId)
-    project_id: Optional[str] = None
-    idea_id: Optional[str] = None
-    liked_by: List[str] = Field(default_factory=list)
+    album_id: str | None = None  
+    environment_id: str | None = None
+    generation_group_id: str | None = None
+    created_by: str | None = None  # Stores User ID (Telegram ID or Web User ObjectId)
+    project_id: str | None = None
+    idea_id: str | None = None
+    liked_by: list[str] = Field(default_factory=list)
     nsfw: bool = False
     created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
     updated_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
diff --git a/models/Idea.py b/models/Idea.py
index b65093b..56985ec 100644
--- a/models/Idea.py
+++ b/models/Idea.py
@@ -1,13 +1,12 @@
 from datetime import datetime
-from typing import Optional, List
 from pydantic import BaseModel, Field
 
 class Idea(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     name: str = "New Idea"
-    description: Optional[str] = None
-    project_id: Optional[str] = None
-    inspiration_id: Optional[str] = None  # Link to Inspiration
+    description: str | None = None
+    project_id: str | None = None
+    inspiration_id: str | None = None  # Link to Inspiration
     created_by: str  # User ID
     is_deleted: bool = False
     created_at: datetime = Field(default_factory=datetime.now)
diff --git a/models/Inspiration.py b/models/Inspiration.py
index 0649772..bb75b7d 100644
--- a/models/Inspiration.py
+++ b/models/Inspiration.py
@@ -1,5 +1,4 @@
 from datetime import datetime, UTC
-from typing import Optional
 
 from pydantic import BaseModel, Field
 
diff --git a/models/Post.py b/models/Post.py
index 4ab5837..2598098 100644
--- a/models/Post.py
+++ b/models/Post.py
@@ -1,14 +1,13 @@
 from datetime import datetime, timezone, UTC
-from typing import Optional, List
 from pydantic import BaseModel, Field, model_validator
 
 
 class Post(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     date: datetime
     topic: str
-    generation_ids: List[str] = Field(default_factory=list)
-    project_id: Optional[str] = None
+    generation_ids: list[str] = Field(default_factory=list)
+    project_id: str | None = None
     created_by: str
     is_deleted: bool = False
     created_at: datetime = Field(default_factory=lambda: datetime.now(UTC))
diff --git a/models/Project.py b/models/Project.py
index 65bbb59..34815ac 100644
--- a/models/Project.py
+++ b/models/Project.py
@@ -1,12 +1,11 @@
 from datetime import datetime
-from typing import List, Optional
 from pydantic import BaseModel, Field
 
 class Project(BaseModel):
-    id: Optional[str] = None
+    id: str | None = None
     name: str
-    description: Optional[str] = None
+    description: str | None = None
     owner_id: str
-    members: List[str] = [] # List of User IDs
+    members: list[str] = [] # List of User IDs
     is_deleted: bool = False
     created_at: datetime = Field(default_factory=datetime.now)
diff --git a/models/enums.py b/models/enums.py
index cfc7401..0401bb1 100644
--- a/models/enums.py
+++ b/models/enums.py
@@ -52,3 +52,20 @@ class GenType(str, Enum):
             GenType.TEXT: 'Text',
             GenType.IMAGE: 'Image',
         }[self]
+
+
+class TextModel(str, Enum):
+    GEMINI_3_1_PRO_PREVIEW = "gemini-3.1-pro-preview"
+
+    @property
+    def value_model(self) -> str:
+        return self.value
+
+
+class ImageModel(str, Enum):
+    GEMINI_3_PRO_IMAGE_PREVIEW = "gemini-3-pro-image-preview"
+    GEMINI_3_1_FLASH_IMAGE_PREVIEW = "gemini-3.1-flash-image-preview"
+
+    @property
+    def value_model(self) -> str:
+        return self.value