Update app.py

app.py

@@ -233,8 +233,7 @@ def estimate_tokens(text):
 def question_reformulation(question):
     from openai import OpenAI
 
-    OPENAI_API_KEY = "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"
-    client = OpenAI(api_key=OPENAI_API_KEY)
+    client = OpenAI(api_key=openai_key)
     
     stream = client.chat.completions.create(
         model="gpt-4o",