diff --git a/reginaldCog/llm_clients/llm_client.py b/reginaldCog/llm_clients/llm_client.py
new file mode 100644
index 0000000..7ecfe24
--- /dev/null
+++ b/reginaldCog/llm_clients/llm_client.py
@@ -0,0 +1,154 @@
+from itertools import zip_longest
+from abc import ABC, abstractmethod
+from enum import Enum
+from openai import OpenAI
+
+
+class ILLMContent(ABC):
+    pass
+
+
+class OpenAIContent(ILLMContent):
+    def __init__(self):
+        self._content_items: list[dict[str, str]] = []
+
+    @property
+    def content_items(self) -> list[dict]:
+        return self._content_items
+
+    @content_items.setter
+    def content_items(self, value: list[dict[str, str]]):
+        self._content_items = value
+
+
+class ILLMContentBuilder(ABC):
+    pass
+
+
+class OpenAIContentBuilder(ILLMContentBuilder):
+    def __init__(self, content: OpenAIContent):
+        self.content = content
+
+    def add_output_text(self, text: str):
+        item = {"type": "output_text", "text": text}
+        self.content.content_items.append(item)
+        return self
+
+    def add_input_text(self, text: str):
+        item = {"type": "input_text", "text": text}
+        self.content.content_items.append(item)
+        return self
+
+    def add_input_image(self, image_url: str):
+        item = {"type": "input_image", "image_url": image_url}
+        self.content.content_items.append(item)
+        return self
+
+
+class ILLMMessage(ABC):
+    pass
+
+
+class OpenAIMessage(ILLMMessage):
+    def __init__(self):
+        self.content = OpenAIContent()
+        self.role = ""
+
+    @property
+    def to_dict(self):
+        return {"role": self.role, "content": self.content.content_items}
+
+
+class ILLMMessageBuilder(ABC):
+    pass
+
+
+class OpenAIMessageBuilder(ILLMMessageBuilder):
+    def __init__(self, message: OpenAIMessage):
+        self.message = message
+
+    def set_role(self, role: str):
+        self.message.role = role
+        return self
+
+    def set_content(self, content: OpenAIContent):
+        self.message.content = content
+        return self
+
+
+class ILLMPrompt(ABC):
+    pass
+
+
+class OpenAIPrompt(ILLMPrompt):
+    def __init__(self):
+        self.messages = []
+
+    @property
+    def to_list(self):
+        return [i_message.to_dict for i_message in self.messages]
+
+
+class ILLMPromptBuilder(ABC):
+    @abstractmethod
+    def __init__(self, prompt: ILLMPrompt):
+        pass
+
+    @abstractmethod
+    def add_message(self, message: ILLMMessage):
+        pass
+
+
+class OpenAIPromptBuilder(ILLMPromptBuilder):
+    def __init__(self, prompt: OpenAIPrompt):
+        self.prompt = prompt
+
+    def add_message(self, message: OpenAIMessage):
+        self.prompt.messages.append(message)
+
+
+class ILLMClient(ABC):
+    @abstractmethod
+    def get_response(self, prompt: ILLMPrompt):
+        pass
+
+
+class OpenAIClient(ILLMClient):
+    def __init__(self):
+        self.model = 'gpt-4.1-mini'
+        self.client = OpenAI()
+
+    def get_response(self, prompt: OpenAIPrompt):
+        response_input = {"model": self.model, "input": prompt.to_list}
+        return self.client.responses.create(**response_input)
+
+
+if __name__ == "__main__":
+    dev_message_text = "You are a butler named Reginald. Give your answers in a refined manners of the English butler."
+    user_message_text = "Hi! Tell me about yourself!"
+
+    # Create developer message content and message
+    dev_content = OpenAIContent()
+    dev_content_builder = OpenAIContentBuilder(dev_content).add_input_text(dev_message_text)
+    dev_message = OpenAIMessage()
+    OpenAIMessageBuilder(dev_message).set_role("developer").set_content(dev_content)
+
+    # Create user message content and message
+    user_content = OpenAIContent()
+    OpenAIContentBuilder(user_content).add_input_text(user_message_text)
+    user_message = OpenAIMessage()
+    OpenAIMessageBuilder(user_message).set_role("user").set_content(user_content)
+
+    # Create prompt and add messages
+    test_prompt = OpenAIPrompt()
+    prompt_builder = OpenAIPromptBuilder(test_prompt)
+    prompt_builder.add_message(dev_message)
+    prompt_builder.add_message(user_message)
+
+    # Create client and get response
+    client = OpenAIClient()
+    response = client.get_response(test_prompt)
+
+    # Print messages and response
+    print(test_prompt.to_list)
+    print(response)