Update app.py

app.py

@@ -48,7 +48,7 @@ def load_default_pdf():
         llm = ChatOpenAI(
             openai_api_key=OPENROUTER_API_KEY,
             openai_api_base="https://openrouter.ai/api/v1",
-            model="meta-llama/llama-3-8b-instruct:free",
+            model="mistralai/mistral-7b-instruct:free",
             temperature=0.3
         )
 
@@ -106,7 +106,7 @@ def process_pdf(file):
         llm = ChatOpenAI(
             openai_api_key=OPENROUTER_API_KEY,
             openai_api_base="https://openrouter.ai/api/v1",
-            model="meta-llama/llama-3-8b-instruct:free",
+            model="mistralai/mistral-7b-instruct:free",
             temperature=0.3
         )