diff --git a/autogpt/configurator.py b/autogpt/configurator.py
index 0fddd1fa8..98bd0b26d 100644
--- a/autogpt/configurator.py
+++ b/autogpt/configurator.py
@@ -1,9 +1,12 @@
 """Configurator module."""
+from __future__ import annotations
+
 import click
 from colorama import Back, Fore, Style
 
 from autogpt import utils
 from autogpt.config import Config
+from autogpt.llm.llm_utils import check_model
 from autogpt.logs import logger
 from autogpt.memory import get_supported_memory_backends
 
@@ -45,6 +48,8 @@ def create_config(
     CFG.set_debug_mode(False)
     CFG.set_continuous_mode(False)
     CFG.set_speak_mode(False)
+    CFG.set_fast_llm_model(check_model(CFG.fast_llm_model, "fast_llm_model"))
+    CFG.set_smart_llm_model(check_model(CFG.smart_llm_model, "smart_llm_model"))
 
     if debug:
         logger.typewriter_log("Debug Mode: ", Fore.GREEN, "ENABLED")
diff --git a/autogpt/llm/api_manager.py b/autogpt/llm/api_manager.py
index a7777a2b0..82cf1c573 100644
--- a/autogpt/llm/api_manager.py
+++ b/autogpt/llm/api_manager.py
@@ -1,6 +1,9 @@
 from __future__ import annotations
 
+from typing import List, Optional
+
 import openai
+from openai import Model
 
 from autogpt.config import Config
 from autogpt.llm.modelsinfo import COSTS
@@ -14,12 +17,14 @@ class ApiManager(metaclass=Singleton):
         self.total_completion_tokens = 0
         self.total_cost = 0
         self.total_budget = 0
+        self.models: Optional[list[Model]] = None
 
     def reset(self):
         self.total_prompt_tokens = 0
         self.total_completion_tokens = 0
         self.total_cost = 0
         self.total_budget = 0.0
+        self.models = None
 
     def create_chat_completion(
         self,
@@ -127,3 +132,17 @@ class ApiManager(metaclass=Singleton):
         float: The total budget for API calls.
         """
         return self.total_budget
+
+    def get_models(self) -> List[Model]:
+        """
+        Get list of available GPT models.
+
+        Returns:
+        list: List of available GPT models.
+
+        """
+        if self.models is None:
+            all_models = openai.Model.list()["data"]
+            self.models = [model for model in all_models if "gpt" in model["id"]]
+
+        return self.models
diff --git a/autogpt/llm/llm_utils.py b/autogpt/llm/llm_utils.py
index a77bccbc0..fcd1b2d83 100644
--- a/autogpt/llm/llm_utils.py
+++ b/autogpt/llm/llm_utils.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import functools
 import time
 from itertools import islice
-from typing import List, Optional
+from typing import List, Literal, Optional
 
 import numpy as np
 import openai
@@ -293,3 +293,22 @@ def create_embedding(
     )  # normalize the length to one
     chunk_embeddings = chunk_embeddings.tolist()
     return chunk_embeddings
+
+
+def check_model(
+    model_name: str, model_type: Literal["smart_llm_model", "fast_llm_model"]
+) -> str:
+    """Check if model is available for use. If not, return gpt-3.5-turbo."""
+    api_manager = ApiManager()
+    models = api_manager.get_models()
+
+    if any(model_name in m["id"] for m in models):
+        return model_name
+
+    logger.typewriter_log(
+        "WARNING: ",
+        Fore.YELLOW,
+        f"You do not have access to {model_name}. Setting {model_type} to "
+        f"gpt-3.5-turbo.",
+    )
+    return "gpt-3.5-turbo"
diff --git a/autogpt/main.py b/autogpt/main.py
index 792496095..ac27e282d 100644
--- a/autogpt/main.py
+++ b/autogpt/main.py
@@ -47,6 +47,7 @@ def run_auto_gpt(
     cfg = Config()
     # TODO: fill in llm values here
     check_openai_api_key()
+
     create_config(
         continuous,
         continuous_limit,
diff --git a/tests/test_api_manager.py b/tests/test_api_manager.py
index 3d0672c11..bfb842130 100644
--- a/tests/test_api_manager.py
+++ b/tests/test_api_manager.py
@@ -118,3 +118,13 @@ class TestApiManager:
         assert api_manager.get_total_prompt_tokens() == 50
         assert api_manager.get_total_completion_tokens() == 100
         assert api_manager.get_total_cost() == (50 * 0.002 + 100 * 0.002) / 1000
+
+    @staticmethod
+    def test_get_models():
+        """Test if getting models works correctly."""
+        with patch("openai.Model.list") as mock_list_models:
+            mock_list_models.return_value = {"data": [{"id": "gpt-3.5-turbo"}]}
+            result = api_manager.get_models()
+
+            assert result[0]["id"] == "gpt-3.5-turbo"
+            assert api_manager.models[0]["id"] == "gpt-3.5-turbo"
diff --git a/tests/test_config.py b/tests/test_config.py
index e1fc67454..0f38b28cd 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -2,10 +2,11 @@
 Test cases for the Config class, which handles the configuration settings
 for the AI and ensures it behaves as a singleton.
 """
+from unittest.mock import patch
 
-import pytest
+from openai import InvalidRequestError
 
-from autogpt.config import Config
+from autogpt.configurator import create_config
 
 
 def test_initial_values(config):
@@ -117,3 +118,40 @@ def test_set_debug_mode(config):
 
     # Reset debug mode
     config.set_debug_mode(debug_mode)
+
+
+@patch("openai.Model.list")
+def test_smart_and_fast_llm_models_set_to_gpt4(mock_list_models, config):
+    """
+    Test if models update to gpt-3.5-turbo if both are set to gpt-4.
+    """
+    fast_llm_model = config.fast_llm_model
+    smart_llm_model = config.smart_llm_model
+
+    config.fast_llm_model = "gpt-4"
+    config.smart_llm_model = "gpt-4"
+
+    mock_list_models.return_value = {"data": [{"id": "gpt-3.5-turbo"}]}
+
+    create_config(
+        continuous=False,
+        continuous_limit=False,
+        ai_settings_file="",
+        prompt_settings_file="",
+        skip_reprompt=False,
+        speak=False,
+        debug=False,
+        gpt3only=False,
+        gpt4only=False,
+        memory_type="",
+        browser_name="",
+        allow_downloads=False,
+        skip_news=False,
+    )
+
+    assert config.fast_llm_model == "gpt-3.5-turbo"
+    assert config.smart_llm_model == "gpt-3.5-turbo"
+
+    # Reset config
+    config.set_fast_llm_model(fast_llm_model)
+    config.set_smart_llm_model(smart_llm_model)
diff --git a/tests/unit/test_llm_utils.py b/tests/unit/test_llm_utils.py
index be36dc090..e11b368e1 100644
--- a/tests/unit/test_llm_utils.py
+++ b/tests/unit/test_llm_utils.py
@@ -1,7 +1,11 @@
+from unittest.mock import patch
+
 import pytest
+from openai import InvalidRequestError
 from openai.error import APIError, RateLimitError
 
 from autogpt.llm import llm_utils
+from autogpt.llm.llm_utils import check_model
 
 
 @pytest.fixture(params=[RateLimitError, APIError])
@@ -131,3 +135,26 @@ def test_chunked_tokens():
     ]
     output = list(llm_utils.chunked_tokens(text, "cl100k_base", 8191))
     assert output == expected_output
+
+
+def test_check_model(api_manager):
+    """
+    Test if check_model() returns original model when valid.
+    Test if check_model() returns gpt-3.5-turbo when model is invalid.
+    """
+    with patch("openai.Model.list") as mock_list_models:
+        # Test when correct model is returned
+        mock_list_models.return_value = {"data": [{"id": "gpt-4"}]}
+        result = check_model("gpt-4", "smart_llm_model")
+        assert result == "gpt-4"
+
+        # Reset api manager models
+        api_manager.models = None
+
+        # Test when incorrect model is returned
+        mock_list_models.return_value = {"data": [{"id": "gpt-3.5-turbo"}]}
+        result = check_model("gpt-4", "fast_llm_model")
+        assert result == "gpt-3.5-turbo"
+
+        # Reset api manager models
+        api_manager.models = None