diff --git a/Makefile b/Makefile
index 73c358c..21747bd 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ format:
 	@uvx ruff format src/bigdata_research_tools/ examples/ tutorial/ tests/
 
 format-check:
-	@uvx ruff format --check bigdata_thematic_screener/ tests/
+	@uvx ruff format --check src/bigdata_research_tools/ tests/
 
 type-check:
 	@uvx ty@0.0.1a26 check --python-version 3.13 src/bigdata_research_tools/ examples/ tests/ # tutorial/ # Fix version to 3.13 due to this issue https://github.com/astral-sh/ty/issues/1355 # Ignore tutorials, the issues come from this open issue https://github.com/astral-sh/ty/issues/1297
\ No newline at end of file
diff --git a/src/bigdata_research_tools/labeler/labeler.py b/src/bigdata_research_tools/labeler/labeler.py
index f0b9b38..5172b37 100644
--- a/src/bigdata_research_tools/labeler/labeler.py
+++ b/src/bigdata_research_tools/labeler/labeler.py
@@ -169,6 +169,7 @@ def _run_labeling_prompts(
         if provider == "bedrock":
             llm = LLMEngine(
                 model=self.llm_model_config.model,
+                api_selection=self.llm_model_config.api_selection,
                 **self.llm_model_config.connection_config,
             )
             return run_parallel_prompts(
@@ -177,6 +178,7 @@ def _run_labeling_prompts(
         else:
             llm = AsyncLLMEngine(
                 model=self.llm_model_config.model,
+                api_selection=self.llm_model_config.api_selection,
                 **self.llm_model_config.connection_config,
             )
             return run_concurrent_prompts(
diff --git a/src/bigdata_research_tools/llm/azure.py b/src/bigdata_research_tools/llm/azure.py
index 37ac3b9..8a7de3e 100644
--- a/src/bigdata_research_tools/llm/azure.py
+++ b/src/bigdata_research_tools/llm/azure.py
@@ -33,9 +33,10 @@ class AsyncAzureProvider(AsyncLLMProvider):
     def __init__(
         self,
         model: str,
+        api_selection: str | None = None,
         **connection_config,
     ):
-        super().__init__(model, **connection_config)
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client = None
         self.configure_azure_client()
 
@@ -80,11 +81,18 @@ async def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> st
         last_exception = None
         for attempt in range(max_retries):
             try:
-                chat_completion = await self._client.chat.completions.create(
-                    messages=chat_history, model=self.model, **kwargs
-                )
+                if self.api_selection == "chat" or self.api_selection is None:
+                    chat_completion = await self._client.chat.completions.create(
+                        messages=chat_history, model=self.model, **kwargs
+                    )
+
+                    return chat_completion.choices[0].message.content
+                elif self.api_selection == "responses":
+                    response = await self._client.responses.create(
+                        messages=chat_history, model=self.model, **kwargs
+                    )  # ty: ignore
 
-                return chat_completion.choices[0].message.content
+                    return response.output[0].content[0].text
             except Exception as e:
                 await asyncio.sleep(delay)
                 delay = 2 * delay + random.random()  # exponential backoff
@@ -170,9 +178,10 @@ class AzureProvider(LLMProvider):
     def __init__(
         self,
         model: str,
+        api_selection: str | None = None,
         **connection_config,
     ):
-        super().__init__(model, **connection_config)
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client = None
         self.configure_azure_client()
 
@@ -217,11 +226,19 @@ def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:
         last_exception = None
         for attempt in range(max_retries):
             try:
-                chat_completion = self._client.chat.completions.create(
-                    messages=chat_history, model=self.model, **kwargs
-                )
+                if self.api_selection == "chat" or self.api_selection is None:
+                    chat_completion = self._client.chat.completions.create(
+                        messages=chat_history, model=self.model, **kwargs
+                    )
+
+                    return chat_completion.choices[0].message.content
+                elif self.api_selection == "responses":
+                    response = self._client.responses.create(
+                        messages=chat_history, model=self.model, **kwargs
+                    )  # ty: ignore
+
+                    return response.output[0].content[0].text
 
-                return chat_completion.choices[0].message.content
             except Exception as e:
                 time.sleep(delay)
                 delay = 2 * delay + random.random()  # exponential backoff
diff --git a/src/bigdata_research_tools/llm/base.py b/src/bigdata_research_tools/llm/base.py
index d919ae1..0667823 100644
--- a/src/bigdata_research_tools/llm/base.py
+++ b/src/bigdata_research_tools/llm/base.py
@@ -18,6 +18,7 @@ class LLMConfig(BaseModel):
 
     model: str
     response_format: dict = {"type": "json_object"}
+    text: dict = {"format": {"type": "json_object"}}
     temperature: float | None = None
     reasoning_effort: str | None = None
     top_p: float | None = 1
@@ -33,6 +34,11 @@ class LLMConfig(BaseModel):
         description="A pair of key-value connection configurations for the LLM provider, the contents will be passed as kwargs to the provider client.",
     )
 
+    api_selection: str | None = Field(
+        default="chat",
+        description="API selection for the OpenAI based LLM provider, e.g., 'chat' or 'responses'.",
+    )
+
     @model_validator(mode="after")
     def check_temperature_and_reasoning_effort(self):
         ## Only one of temperature or reasoning_effort should be set.
@@ -50,6 +56,20 @@ def check_temperature_and_reasoning_effort(self):
             )
         return self
 
+    @model_validator(mode="after")
+    def check_api_endpoint(self):
+        ## Only one of temperature or reasoning_effort should be set.
+        if self.api_selection is not None:
+            if self.api_selection not in ["chat", "responses"]:
+                raise ValueError(
+                    "Only chat or responses are supported as api_endpoint."
+                )
+            if self.model.split("::")[0] not in ["openai", "azure"]:
+                raise ValueError(
+                    "api_selection is only supported for OpenAI and Azure providers."
+                )
+        return self
+
     @model_validator(mode="after")
     def validate_reasoning_config(self):
         if any(rm in self.model for rm in REASONING_MODELS):
@@ -93,13 +113,30 @@ def get_llm_kwargs(
             config_dict.pop("connection_config", None)
         if remove_timeout:
             config_dict.pop("timeout", None)
+        if self.api_selection is None or self.api_selection == "chat":
+            config_dict.pop("text", None)
+        if self.api_selection == "responses":
+            config_dict.pop("response_format", None)
+            config_dict.pop("frequency_penalty", None)
+            config_dict.pop("presence_penalty", None)
+            config_dict.pop("seed", None)
         # Remove None values and model key
-        return {k: v for k, v in config_dict.items() if v is not None and k != "model"}
+        return {
+            k: v
+            for k, v in config_dict.items()
+            if v is not None and k != "model" and k != "api_selection"
+        }
 
 
 class AsyncLLMProvider(ABC):
-    def __init__(self, model: str | None = None, **connection_config):
+    def __init__(
+        self,
+        model: str | None = None,
+        api_selection: str | None = None,
+        **connection_config,
+    ):
         self.model = model
+        self.api_selection = api_selection
         self.connection_config = connection_config
 
     @abstractmethod
@@ -147,7 +184,12 @@ async def get_stream_response(
 
 
 class AsyncLLMEngine:
-    def __init__(self, model: str | None = None, **connection_config):
+    def __init__(
+        self,
+        model: str | None = None,
+        api_selection: str | None = None,
+        **connection_config,
+    ):
         if model is None:
             model = os.getenv("BIGDATA_RESEARCH_DEFAULT_LLM", "openai::gpt-4o-mini")
             source = "Environment"
@@ -166,6 +208,8 @@ def __init__(self, model: str | None = None, **connection_config):
                 "Invalid model format. It should be `<provider>::<model>`."
             )
 
+        self.api_selection = api_selection
+
         self.provider = self.load_provider(
             provider_name=self.provider_name, **connection_config
         )
@@ -177,16 +221,22 @@ def load_provider(
         if provider == "openai":
             from bigdata_research_tools.llm.openai import AsyncOpenAIProvider
 
-            return AsyncOpenAIProvider(model=self.model, **connection_config)
+            return AsyncOpenAIProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
 
         elif provider == "bedrock":
             from bigdata_research_tools.llm.bedrock import AsyncBedrockProvider
 
-            return AsyncBedrockProvider(model=self.model, **connection_config)
+            return AsyncBedrockProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
         elif provider == "azure":
             from bigdata_research_tools.llm.azure import AsyncAzureProvider
 
-            return AsyncAzureProvider(model=self.model, **connection_config)
+            return AsyncAzureProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
         else:
             logger.error(f"Invalid provider: `{self.provider}`")
 
@@ -230,8 +280,14 @@ async def get_tools_response(
 
 
 class LLMProvider(ABC):
-    def __init__(self, model: str | None = None, **connection_config):
+    def __init__(
+        self,
+        model: str | None = None,
+        api_selection: str | None = None,
+        **connection_config,
+    ):
         self.model = model
+        self.api_selection = api_selection
         self.connection_config = connection_config
 
     @abstractmethod
@@ -278,12 +334,18 @@ def get_stream_response(
 
 
 class LLMEngine:
-    def __init__(self, model: str | None = None, **connection_config):
+    def __init__(
+        self,
+        model: str | None = None,
+        api_selection: str | None = None,
+        **connection_config,
+    ):
         if model is None:
             model = os.getenv("BIGDATA_RESEARCH_DEFAULT_LLM", "openai::gpt-4o-mini")
             source = "Environment"
         else:
             source = "Argument"
+        self.api_selection = api_selection
 
         try:
             self.provider_name, self.model = model.split("::")
@@ -306,15 +368,21 @@ def load_provider(self, provider_name: str, **connection_config) -> LLMProvider:
         if provider == "openai":
             from bigdata_research_tools.llm.openai import OpenAIProvider
 
-            return OpenAIProvider(model=self.model, **connection_config)
+            return OpenAIProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
         elif provider == "bedrock":
             from bigdata_research_tools.llm.bedrock import BedrockProvider
 
-            return BedrockProvider(model=self.model, **connection_config)
+            return BedrockProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
         elif provider == "azure":
             from bigdata_research_tools.llm.azure import AzureProvider
 
-            return AzureProvider(model=self.model, **connection_config)
+            return AzureProvider(
+                model=self.model, api_selection=self.api_selection, **connection_config
+            )
         else:
             logger.error(f"Invalid provider: `{self.provider}`")
 
diff --git a/src/bigdata_research_tools/llm/bedrock.py b/src/bigdata_research_tools/llm/bedrock.py
index f099586..7bc6190 100644
--- a/src/bigdata_research_tools/llm/bedrock.py
+++ b/src/bigdata_research_tools/llm/bedrock.py
@@ -18,8 +18,10 @@
 class AsyncBedrockProvider(AsyncLLMProvider):
     # Asynchronous boto3 is tricky, for now use the synchronous client, this will not
     # provide the benefits from async, but will at least let our workflows run for now
-    def __init__(self, model: str, **connection_config):
-        super().__init__(model, **connection_config)
+    def __init__(
+        self, model: str, api_selection: str | None = None, **connection_config
+    ):
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client: Session | None = None
         self.configure_bedrock_client()
 
@@ -179,8 +181,10 @@ async def get_stream_response(
 
 
 class BedrockProvider(LLMProvider):
-    def __init__(self, model: str, **connection_config):
-        super().__init__(model, **connection_config)
+    def __init__(
+        self, model: str, api_selection: str | None = None, **connection_config
+    ):
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client: Session | None = None
         self.configure_bedrock_client()
 
diff --git a/src/bigdata_research_tools/llm/openai.py b/src/bigdata_research_tools/llm/openai.py
index 54b7116..6e08522 100644
--- a/src/bigdata_research_tools/llm/openai.py
+++ b/src/bigdata_research_tools/llm/openai.py
@@ -19,8 +19,10 @@
 
 
 class AsyncOpenAIProvider(AsyncLLMProvider):
-    def __init__(self, model: str, **connection_config):
-        super().__init__(model, **connection_config)
+    def __init__(
+        self, model: str, api_selection: str | None = None, **connection_config
+    ):
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client = None
         self.configure_openai_client()
 
@@ -36,7 +38,7 @@ def configure_openai_client(self) -> None:
         if not self._client:
             self._client = AsyncOpenAI(**self.connection_config)
 
-    async def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:
+    async def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:  # ty: ignore
         """
         Get the response from an LLM model from OpenAI.
 
@@ -49,11 +51,19 @@ async def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> st
         """
         if not self._client:
             raise NotInitializedLLMProviderError(self)
-        chat_completion = await self._client.chat.completions.create(
-            messages=chat_history, model=self.model, **kwargs
-        )
 
-        return chat_completion.choices[0].message.content
+        if self.api_selection == "chat" or self.api_selection is None:
+            chat_completion = await self._client.chat.completions.create(
+                messages=chat_history, model=self.model, **kwargs
+            )
+
+            return chat_completion.choices[0].message.content
+
+        elif self.api_selection == "responses":
+            response = await self._client.responses.create(
+                input=chat_history, model=self.model, **kwargs
+            )
+            return response.output[0].content[0].text
 
     async def get_tools_response(
         self,
@@ -127,9 +137,10 @@ class OpenAIProvider(LLMProvider):
     def __init__(
         self,
         model: str,
+        api_selection: str | None = None,
         **connection_config,
     ):
-        super().__init__(model, **connection_config)
+        super().__init__(model, api_selection=api_selection, **connection_config)
         self._client = None
         self.configure_openai_client()
 
@@ -145,7 +156,7 @@ def configure_openai_client(self) -> None:
         if not self._client:
             self._client = OpenAI(**self.connection_config)
 
-    def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:
+    def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:  # ty: ignore
         """
         Get the response from an LLM model from OpenAI.
 
@@ -158,11 +169,19 @@ def get_response(self, chat_history: list[dict[str, str]], **kwargs) -> str:
         """
         if not self._client:
             raise NotInitializedLLMProviderError(self)
-        chat_completion = self._client.chat.completions.create(
-            messages=chat_history, model=self.model, **kwargs
-        )
 
-        return chat_completion.choices[0].message.content
+        if self.api_selection == "chat" or self.api_selection is None:
+            chat_completion = self._client.chat.completions.create(
+                messages=chat_history, model=self.model, **kwargs
+            )
+
+            return chat_completion.choices[0].message.content
+        elif self.api_selection == "responses":
+            response = self._client.responses.create(
+                input=chat_history, model=self.model, **kwargs
+            )
+
+            return response.output[0].content[0].text
 
     def get_tools_response(
         self,