diff --git a/README.md b/README.md
index 16b1ff2..3773d5e 100755
--- a/README.md
+++ b/README.md
@@ -225,13 +225,13 @@ Exceptions:
 ## 1. chat() - AI chat
 
 ```python
-def chat(self, keywords: str, model: str = "gpt-3.5", timeout: int = 20) -> str:
+def chat(self, keywords: str, model: str = "gpt-4o-mini", timeout: int = 20) -> str:
     """Initiates a chat session with DuckDuckGo AI.
 
     Args:
         keywords (str): The initial message or question to send to the AI.
-        model (str): The model to use: "gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
-            Defaults to "gpt-3.5".
+        model (str): The model to use: "gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
+            Defaults to "gpt-4o-mini".
         timeout (int): Timeout value for the HTTP client. Defaults to 20.
 
     Returns:
diff --git a/duckduckgo_search/cli.py b/duckduckgo_search/cli.py
index c49760a..8445baa 100644
--- a/duckduckgo_search/cli.py
+++ b/duckduckgo_search/cli.py
@@ -141,7 +141,7 @@ def version():
     "-m",
     "--model",
     prompt="""DuckDuckGo AI chat. Choose a model: 
-[1]: gpt-3.5
+[1]: gpt-4o-mini
 [2]: claude-3-haiku
 [3]: llama-3-70b
 [4]: mixtral-8x7b
@@ -153,7 +153,7 @@ def version():
 def chat(load, proxy, multiline, timeout, model):
     """CLI function to perform an interactive AI chat using DuckDuckGo API."""
     client = DDGS(proxy=_expand_proxy_tb_alias(proxy))
-    model = ["gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"][int(model) - 1]
+    model = ["gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"][int(model) - 1]
 
     cache_file = "ddgs_chat_conversation.json"
     if load and Path(cache_file).exists():
diff --git a/duckduckgo_search/duckduckgo_search.py b/duckduckgo_search/duckduckgo_search.py
index f357691..11c6515 100644
--- a/duckduckgo_search/duckduckgo_search.py
+++ b/duckduckgo_search/duckduckgo_search.py
@@ -133,13 +133,13 @@ def _get_vqd(self, keywords: str) -> str:
         resp_content = self._get_url("POST", "https://duckduckgo.com", data={"q": keywords})
         return _extract_vqd(resp_content, keywords)
 
-    def chat(self, keywords: str, model: str = "gpt-3.5", timeout: int = 20) -> str:
+    def chat(self, keywords: str, model: str = "gpt-4o-mini", timeout: int = 20) -> str:
         """Initiates a chat session with DuckDuckGo AI.
 
         Args:
             keywords (str): The initial message or question to send to the AI.
-            model (str): The model to use: "gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
-                Defaults to "gpt-3.5".
+            model (str): The model to use: "gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
+                Defaults to "gpt-4o-mini".
             timeout (int): Timeout value for the HTTP client. Defaults to 20.
 
         Returns:
@@ -147,7 +147,7 @@ def chat(self, keywords: str, model: str = "gpt-3.5", timeout: int = 20) -> str:
         """
         models = {
             "claude-3-haiku": "claude-3-haiku-20240307",
-            "gpt-3.5": "gpt-3.5-turbo-0125",
+            "gpt-4o-mini": "gpt-4o-mini",
             "llama-3-70b": "meta-llama/Llama-3-70b-chat-hf",
             "mixtral-8x7b": "mistralai/Mixtral-8x7B-Instruct-v0.1",
         }
diff --git a/duckduckgo_search/duckduckgo_search_async.py b/duckduckgo_search/duckduckgo_search_async.py
index b02cf69..a6467b7 100644
--- a/duckduckgo_search/duckduckgo_search_async.py
+++ b/duckduckgo_search/duckduckgo_search_async.py
@@ -36,13 +36,13 @@ async def __aexit__(
     ) -> None:
         pass
 
-    async def achat(self, keywords: str, model: str = "gpt-3.5") -> str:
+    async def achat(self, keywords: str, model: str = "gpt-4o-mini") -> str:
         """Initiates async chat session with DuckDuckGo AI.
 
         Args:
             keywords (str): The initial message or question to send to the AI.
-            model (str): The model to use: "gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
-                Defaults to "gpt-3.5".
+            model (str): The model to use: "gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b".
+                Defaults to "gpt-4o-mini".
 
         Returns:
             str: The response from the AI.
diff --git a/tests/test_duckduckgo_search.py b/tests/test_duckduckgo_search.py
index eeb1431..8c5fa5b 100644
--- a/tests/test_duckduckgo_search.py
+++ b/tests/test_duckduckgo_search.py
@@ -15,7 +15,7 @@ def test_context_manager():
         assert 20 <= len(results) <= 30
 
 
-@pytest.mark.parametrize("model", ["gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"])
+@pytest.mark.parametrize("model", ["gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"])
 def test_chat(model):
     results = DDGS().chat("cat", model=model)
     assert  len(results) >= 1
diff --git a/tests/test_duckduckgo_search_async.py b/tests/test_duckduckgo_search_async.py
index 99b32d0..b5d0223 100644
--- a/tests/test_duckduckgo_search_async.py
+++ b/tests/test_duckduckgo_search_async.py
@@ -16,7 +16,7 @@ async def test_context_manager():
 
 
 @pytest.mark.asyncio
-@pytest.mark.parametrize("model", ["gpt-3.5", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"])
+@pytest.mark.parametrize("model", ["gpt-4o-mini", "claude-3-haiku", "llama-3-70b", "mixtral-8x7b"])
 async def test_chat(model):
     results = await AsyncDDGS().achat("cat", model=model)
     assert  len(results) >= 1