diff --git a/application/api/answer/routes.py b/application/api/answer/routes.py
index 4c393714..4c86cf4b 100644
--- a/application/api/answer/routes.py
+++ b/application/api/answer/routes.py
@@ -28,12 +28,15 @@ vectors_collection = db["vectors"]
 prompts_collection = db["prompts"]
 answer = Blueprint('answer', __name__)
 
-if settings.LLM_NAME == "gpt4":
-    gpt_model = 'gpt-4'
+gpt_model = ""
+# to have some kind of default behaviour
+if settings.LLM_NAME == "openai":
+    gpt_model = 'gpt-3.5-turbo'
 elif settings.LLM_NAME == "anthropic":
     gpt_model = 'claude-2'
-else:
-    gpt_model = 'gpt-3.5-turbo'
+
+if settings.MODEL_NAME:  # in case there is particular model name configured
+    gpt_model = settings.MODEL_NAME
 
 # load the prompts
 current_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
diff --git a/application/core/settings.py b/application/core/settings.py
index 84073b7d..0e1909e6 100644
--- a/application/core/settings.py
+++ b/application/core/settings.py
@@ -9,6 +9,7 @@ current_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__
 
 class Settings(BaseSettings):
     LLM_NAME: str = "docsgpt"
+    MODEL_NAME: Optional[str] = None # when LLM_NAME is openai, MODEL_NAME can be e.g. gpt-4-turbo-preview or gpt-3.5-turbo
     EMBEDDINGS_NAME: str = "huggingface_sentence-transformers/all-mpnet-base-v2"
     CELERY_BROKER_URL: str = "redis://localhost:6379/0"
     CELERY_RESULT_BACKEND: str = "redis://localhost:6379/1"