diff --git a/clean_cache.sh b/clean_cache.sh
new file mode 100755
index 00000000..c275e548
--- /dev/null
+++ b/clean_cache.sh
@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -e
+
+# 預設清理當前目錄，也可以傳入指定目錄
+TARGET_DIR="${1:-.}"
+
+echo "🧹 Cleaning __pycache__ & .DS_Store under: $TARGET_DIR"
+
+# 刪除所有 __pycache__ 資料夾
+find "$TARGET_DIR" -type d -name "__pycache__" -exec rm -rf {} +
+
+# 刪除所有 .DS_Store 檔案
+find "$TARGET_DIR" -type f -name ".DS_Store" -delete
+
+echo "✅ Done. All __pycache__ and .DS_Store removed."
diff --git a/tradingagents/default_config.py b/tradingagents/default_config.py
index e56b7950..80084e8e 100644
--- a/tradingagents/default_config.py
+++ b/tradingagents/default_config.py
@@ -10,7 +10,7 @@ DEFAULT_CONFIG = {
     ),
     # LLM 設定
     "llm_provider": "openai",
-    "deep_think_llm": "o4-mini",
+    "deep_think_llm": "gpt-4o-mini",
     "quick_think_llm": "gpt-4o-mini",
     "backend_url": "https://api.openai.com/v1",
     # 辯論與討論設定
diff --git a/tradingagents/graph/trading_graph.py b/tradingagents/graph/trading_graph.py
index 64a6f940..1a19cc1f 100644
--- a/tradingagents/graph/trading_graph.py
+++ b/tradingagents/graph/trading_graph.py
@@ -84,8 +84,18 @@ class TradingAgentsGraph:
         # 初始化 LLM
         provider = self.config["llm_provider"].lower()
         if provider in ["openai", "ollama", "openrouter"]:
-            self.deep_thinking_llm = ChatOpenAI(model=self.config["deep_think_llm"], base_url=self.config["backend_url"])
-            self.quick_thinking_llm = ChatOpenAI(model=self.config["quick_think_llm"], base_url=self.config["backend_url"])
+            # Get the OpenAI API key from environment variable
+            openai_api_key = os.getenv("OPENAI_API_KEY")
+            self.deep_thinking_llm = ChatOpenAI(
+                model=self.config["deep_think_llm"],
+                base_url=self.config["backend_url"],
+                openai_api_key=openai_api_key
+            )
+            self.quick_thinking_llm = ChatOpenAI(
+                model=self.config["quick_think_llm"],
+                base_url=self.config["backend_url"],
+                openai_api_key=openai_api_key
+            )
         elif provider == "anthropic":
             self.deep_thinking_llm = ChatAnthropic(model=self.config["deep_think_llm"], base_url=self.config["backend_url"])
             self.quick_thinking_llm = ChatAnthropic(model=self.config["quick_think_llm"], base_url=self.config["backend_url"])
@@ -94,7 +104,7 @@ class TradingAgentsGraph:
             self.quick_thinking_llm = ChatGoogleGenerativeAI(model=self.config["quick_think_llm"])
         else:
             raise ValueError(f"不支援的 LLM 供應商: {self.config['llm_provider']}")
-        
+
         # 初始化記憶體
         self.bull_memory = FinancialSituationMemory("bull_memory", self.config)
         self.bear_memory = FinancialSituationMemory("bear_memory", self.config)