diff --git a/pos/services/ai_chat.py b/pos/services/ai_chat.py
index 7aa61f0..d7cbd52 100644
--- a/pos/services/ai_chat.py
+++ b/pos/services/ai_chat.py
@@ -6,7 +6,7 @@ import json
 from config import OPENROUTER_API_KEY
 
 OPENROUTER_URL = "https://openrouter.ai/api/v1/chat/completions"
-MODEL = "anthropic/claude-haiku-4.5"  # Fast + cheap for chat
+MODEL = "qwen/qwen3-6b-preview:free"  # Qwen 3.6 Plus Preview (free on OpenRouter)
 
 SYSTEM_PROMPT = """Eres un asistente de refaccionaria automotriz mexicana. Tu trabajo es ayudar a encontrar autopartes.