did openai really change their api?

llm.py

@@ -1,8 +1,10 @@
-import openai
+from openai import OpenAI
 import os
 
 openai.api_key = os.environ["OPENAI_API_KEY"]
 
+client = OpenAI()
+
 class BaseLLM:
     def __init__(self, model):
         self.model = model
@@ -16,7 +18,7 @@ class OpenAILLM(BaseLLM):
         self.model = model
     
     def get_response(self, system_prompt, query, **kwargs):
-        response = openai.ChatCompletion.create(
+        response = client.chat.completions.create(
             model=self.model,
             messages=[
                 {"role": "system", "content": system_prompt},