Update app.py

app.py

@@ -17,7 +17,7 @@ from sentence_transformers import SentenceTransformer
 # ----------------------------
 # Model configuration
 # ----------------------------
-GEN_MODEL_NAME = os.getenv("GEN_MODEL_NAME", "microsoft/Phi-3-mini-4k-instruct")
+GEN_MODEL_NAME = os.getenv("GEN_MODEL_NAME", "Qwen/Qwen2.5-0.5B-Instruct")
 EMB_MODEL_NAME = os.getenv("EMB_MODEL_NAME", "sentence-transformers/all-MiniLM-L6-v2")
 
 _tok = None