diff --git a/llm_client/llm_api_client/ai21_client.py b/llm_client/llm_api_client/ai21_client.py
index ef14861..46617a3 100644
--- a/llm_client/llm_api_client/ai21_client.py
+++ b/llm_client/llm_api_client/ai21_client.py
@@ -22,7 +22,7 @@ def __init__(self, config: LLMAPIClientConfig):
         self._headers[AUTH_HEADER] = BEARER_TOKEN + self._api_key
 
     async def text_completion(self, prompt: str, model: Optional[str] = None, max_tokens: int = 16,
-                              temperature: float = 0.7, top_p: Optional[float] = None ,**kwargs) -> list[str]:
+                              temperature: float = 0.7, top_p: float = 1  ,**kwargs) -> list[str]:
         model = model or self._default_model
         kwargs[PROMPT_KEY] = prompt
         kwargs["topP"] = kwargs.pop("topP", top_p)
diff --git a/llm_client/llm_api_client/aleph_alpha_client.py b/llm_client/llm_api_client/aleph_alpha_client.py
index 01138b2..1aaff3e 100644
--- a/llm_client/llm_api_client/aleph_alpha_client.py
+++ b/llm_client/llm_api_client/aleph_alpha_client.py
@@ -27,7 +27,7 @@ def __init__(self, config: LLMAPIClientConfig):
         self._headers[AUTH_HEADER] = BEARER_TOKEN + self._api_key
 
     async def text_completion(self, prompt: str, model: Optional[str] = None, max_tokens: Optional[int] = None,
-                              temperature: float = 0,top_p: Optional[float] = None, **kwargs) -> \
+                              temperature: float = 0,top_p: float = 0, **kwargs) -> \
             list[str]:
         self._set_model_in_kwargs(kwargs, model)
         if max_tokens is None:
diff --git a/llm_client/llm_api_client/anthropic_client.py b/llm_client/llm_api_client/anthropic_client.py
index 3f41c7d..644a866 100644
--- a/llm_client/llm_api_client/anthropic_client.py
+++ b/llm_client/llm_api_client/anthropic_client.py
@@ -27,14 +27,15 @@ def __init__(self, config: LLMAPIClientConfig):
         self._headers[AUTH_HEADER] = self._api_key
 
     async def text_completion(self, prompt: str, model: Optional[str] = None, max_tokens: Optional[int] = None,
-                              temperature: float = 1, top_p: float = -1,
+                              temperature: float = 1, top_p: Optional[float] = None,
                               **kwargs) -> \
             list[str]:
         if max_tokens is None and kwargs.get(MAX_TOKENS_KEY) is None:
             raise ValueError(f"max_tokens or {MAX_TOKENS_KEY} must be specified")
+        if top_p:
+            kwargs["top_p"] = top_p
         self._set_model_in_kwargs(kwargs, model)
         kwargs[PROMPT_KEY] = prompt
-        kwargs["top_p"] = top_p
         kwargs[MAX_TOKENS_KEY] = kwargs.pop(MAX_TOKENS_KEY, max_tokens)
         kwargs["temperature"] = temperature
         response = await self._session.post(self._base_url + COMPLETE_PATH,
diff --git a/tests/llm_api_client/ai21_client/test_ai21.py b/tests/llm_api_client/ai21_client/test_ai21.py
index bf96278..beff1a2 100644
--- a/tests/llm_api_client/ai21_client/test_ai21.py
+++ b/tests/llm_api_client/ai21_client/test_ai21.py
@@ -30,7 +30,7 @@ async def test_text_completion__sanity(mock_aioresponse, llm_client, url):
         'friends, entertaining family...you get the point! One of my favorite things to do is plan parties']
     mock_aioresponse.assert_called_once_with(url, method='POST',
                                              headers={AUTH_HEADER: BEARER_TOKEN + llm_client._api_key },
-                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : None },
+                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : 0 },
                                              raise_for_status=True)
 
 
@@ -49,7 +49,7 @@ async def test_text_completion__return_multiple_completions(mock_aioresponse, ll
     ]
     mock_aioresponse.assert_called_once_with(url, method='POST',
                                              headers={AUTH_HEADER: BEARER_TOKEN + llm_client._api_key},
-                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : None  },
+                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : 0  },
                                              raise_for_status=True)
 
 
@@ -69,7 +69,7 @@ async def test_text_completion__override_model(mock_aioresponse, llm_client):
         'friends, entertaining family...you get the point! One of my favorite things to do is plan parties']
     mock_aioresponse.assert_called_once_with(url, method='POST',
                                              headers={AUTH_HEADER: BEARER_TOKEN + llm_client._api_key},
-                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : None  },
+                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 16, "temperature" : 0.7, "topP" : 0  },
                                              raise_for_status=True)
 
 
@@ -87,7 +87,7 @@ async def test_text_completion__with_kwargs(mock_aioresponse, llm_client, url):
         'friends, entertaining family...you get the point! One of my favorite things to do is plan parties']
     mock_aioresponse.assert_called_once_with(url, method='POST',
                                              headers={AUTH_HEADER: BEARER_TOKEN + llm_client._api_key},
-                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 10, "temperature" : 0.7 ,"topP" : None},
+                                             json={'prompt': 'These are a few of my favorite', "maxTokens" : 10, "temperature" : 0.7 ,"topP" : 0},
                                              raise_for_status=True)
 
 
diff --git a/tests/resources/openai/chat_completion.json b/tests/resources/openai/chat_completion.json
index 3bbe453..8929ea6 100644
--- a/tests/resources/openai/chat_completion.json
+++ b/tests/resources/openai/chat_completion.json
@@ -13,7 +13,5 @@
   "usage": {
     "prompt_tokens": 9,
     "completion_tokens": 12,
-    "total_tokens": 21,
-        "top_p" : 1
-  }
+    "total_tokens": 21,}
 }
diff --git a/tests/resources/openai/text_completion.json b/tests/resources/openai/text_completion.json
index 38382c2..18a1b3e 100644
--- a/tests/resources/openai/text_completion.json
+++ b/tests/resources/openai/text_completion.json
@@ -14,7 +14,5 @@
   "usage": {
     "prompt_tokens": 5,
     "completion_tokens": 7,
-    "total_tokens": 12,
-    "top_p" : 1
-  }
+    "total_tokens": 12}
 }