diff --git a/tradingagents/default_config.py b/tradingagents/default_config.py
index ecf0dc29..8c7de36e 100644
--- a/tradingagents/default_config.py
+++ b/tradingagents/default_config.py
@@ -8,10 +8,10 @@ DEFAULT_CONFIG = {
         "dataflows/data_cache",
     ),
     # LLM settings
-    "llm_provider": "openai",
-    "deep_think_llm": "gpt-5.2",
-    "quick_think_llm": "gpt-5-mini",
-    "backend_url": "https://api.openai.com/v1",
+    "llm_provider": "codex_oauth",
+    "deep_think_llm": "gpt-5.4",
+    "quick_think_llm": "gpt-5.2",
+    "backend_url": "https://chatgpt.com/backend-api",
     # Provider-specific thinking configuration
     "google_thinking_level": None,      # "high", "minimal", etc.
     "openai_reasoning_effort": None,    # "medium", "high", "low"