Update app.py

app.py

@@ -14,7 +14,7 @@ def load_api_key():
     if "OPENROUTER_API_KEY" in os.environ:
         return os.getenv("OPENROUTER_API_KEY")
     raise ValueError("API key not found in environment variables")
-
+OPENROUTER_API_KEY=load_api_key()
 # Process PDF files
 def process_pdfs(files):
     all_chunks = []
@@ -52,7 +52,7 @@ def process_pdfs(files):
 def load_model():
     return ChatOpenAI(
         base_url="https://openrouter.ai/api/v1",
-        api_key=load_api_key(),
+        api_key=OPENROUTER_API_KEY,
         model="mistralai/mistral-7b-instruct",
         temperature=0.3
     )