Update Web/backend/main.py

Web/backend/main.py

@@ -661,9 +661,9 @@ async def generate_improve_reframe(request: ImproveRequest):
             ai_feedback = await client.post(
                 f"{API_base}prompts/templates/execute",
                 json={
-                    "provider": "groq",
+                    "provider": "openai",
                     "template_name": "reframe.thera_supervisor_full", 
-                    "model": "openai/gpt-oss-20b",
+                    "model": "gpt-4.1",
                     "variables": {
                         "situation": request.situation,
                         "thought": request.thought,