diff --git a/README.md b/README.md
index 98ce3dff..98e1c244 100644
--- a/README.md
+++ b/README.md
@@ -149,7 +149,7 @@ messages = [
 
 chat_completions = client.chat.completions.create(
     messages=messages,
-    model="jamba-instruct",
+    model="jamba-instruct-preview",
 )
 ```
 
diff --git a/ai21/clients/studio/resources/chat/chat_completions.py b/ai21/clients/studio/resources/chat/chat_completions.py
index 20ca4030..503bc65b 100644
--- a/ai21/clients/studio/resources/chat/chat_completions.py
+++ b/ai21/clients/studio/resources/chat/chat_completions.py
@@ -17,29 +17,19 @@ def create(
         self,
         model: str,
         messages: List[ChatMessage],
-        n: int | NotGiven = NOT_GIVEN,
-        logprobs: bool | NotGiven = NOT_GIVEN,
-        top_logprobs: int | NotGiven = NOT_GIVEN,
         max_tokens: int | NotGiven = NOT_GIVEN,
         temperature: float | NotGiven = NOT_GIVEN,
         top_p: float | NotGiven = NOT_GIVEN,
         stop: str | List[str] | NotGiven = NOT_GIVEN,
-        frequency_penalty: float | NotGiven = NOT_GIVEN,
-        presence_penalty: float | NotGiven = NOT_GIVEN,
         **kwargs: Any,
     ) -> ChatCompletionResponse:
         body = self._create_body(
             model=model,
             messages=messages,
-            n=n,
-            logprobs=logprobs,
-            top_logprobs=top_logprobs,
             stop=stop,
             temperature=temperature,
             max_tokens=max_tokens,
             top_p=top_p,
-            frequency_penalty=frequency_penalty,
-            presence_penalty=presence_penalty,
             **kwargs,
         )
 
@@ -51,15 +41,10 @@ def _create_body(
         self,
         model: str,
         messages: List[ChatMessage],
-        n: Optional[int] | NotGiven,
-        logprobs: Optional[bool] | NotGiven,
-        top_logprobs: Optional[int] | NotGiven,
         max_tokens: Optional[int] | NotGiven,
         temperature: Optional[float] | NotGiven,
         top_p: Optional[float] | NotGiven,
         stop: Optional[Union[str, List[str]]] | NotGiven,
-        frequency_penalty: Optional[float] | NotGiven,
-        presence_penalty: Optional[float] | NotGiven,
         **kwargs: Any,
     ) -> Dict[str, Any]:
         return remove_not_given(
@@ -68,13 +53,8 @@ def _create_body(
                 "messages": messages,
                 "temperature": temperature,
                 "maxTokens": max_tokens,
-                "n": n,
                 "topP": top_p,
-                "logprobs": logprobs,
-                "topLogprobs": top_logprobs,
                 "stop": stop,
-                "frequencyPenalty": frequency_penalty,
-                "presencePenalty": presence_penalty,
                 **kwargs,
             }
         )
diff --git a/examples/studio/chat/chat_completions.py b/examples/studio/chat/chat_completions.py
index 3a0eb903..e340a7e9 100644
--- a/examples/studio/chat/chat_completions.py
+++ b/examples/studio/chat/chat_completions.py
@@ -13,15 +13,10 @@
 response = client.chat.completions.create(
     messages=messages,
     model="new-model-name",
-    n=2,
-    logprobs=True,
-    top_logprobs=2,
     max_tokens=100,
     temperature=0.7,
     top_p=1.0,
     stop=["\n"],
-    frequency_penalty=0.1,
-    presence_penalty=0.1,
 )
 
 print(response)
diff --git a/tests/integration_tests/clients/studio/test_chat_completions.py b/tests/integration_tests/clients/studio/test_chat_completions.py
index a98f79eb..5aef4fff 100644
--- a/tests/integration_tests/clients/studio/test_chat_completions.py
+++ b/tests/integration_tests/clients/studio/test_chat_completions.py
@@ -6,7 +6,7 @@
 from ai21.models.chat.chat_completion_response import ChatCompletionResponse
 
 
-_MODEL = "new-model-name"
+_MODEL = "jamba-instruct-preview"
 _MESSAGES = [
     ChatMessage(
         content="Hello, I need help studying for the coming test, can you teach me about the US constitution? ",
@@ -27,13 +27,9 @@ def test_chat_completion():
         messages=messages,
         num_results=num_results,
         max_tokens=64,
-        logprobs=True,
-        top_logprobs=0.6,
         temperature=0.7,
         stop=["\n"],
         top_p=0.3,
-        frequency_penalty=0.2,
-        presence_penalty=0.4,
     )
 
     assert isinstance(response, ChatCompletionResponse)