Merge pull request #1596 from pipecat-ai/mb/gpt-4.1

Update services and examples to use gpt-4.1 by default

examples/simple-chatbot/server/bot-openai.py

@@ -155,7 +155,7 @@ async def main():
         )
 
         # Initialize LLM service
-        llm = OpenAILLMService(api_key=os.getenv("OPENAI_API_KEY"), model="gpt-4o")
+        llm = OpenAILLMService(api_key=os.getenv("OPENAI_API_KEY"))
 
         messages = [
             {