diff --git a/app/tool/web_search.py b/app/tool/web_search.py
index cd23f5d..7b1018b 100644
--- a/app/tool/web_search.py
+++ b/app/tool/web_search.py
@@ -1,8 +1,9 @@
 import asyncio
 from typing import List
 
-from app.config import config
 from tenacity import retry, stop_after_attempt, wait_exponential
+
+from app.config import config
 from app.tool.base import BaseTool
 from app.tool.search import (
     BaiduSearchEngine,
@@ -11,10 +12,11 @@ from app.tool.search import (
     WebSearchEngine,
 )
 
+
 class WebSearch(BaseTool):
     name: str = "web_search"
-    description: str = """Perform a web search and return a list of relevant links. 
-    This function attempts to use the primary search engine API to get up-to-date results. 
+    description: str = """Perform a web search and return a list of relevant links.
+    This function attempts to use the primary search engine API to get up-to-date results.
     If an error occurs, it falls back to an alternative search engine."""
     parameters: dict = {
         "type": "object",
@@ -52,13 +54,15 @@ class WebSearch(BaseTool):
         for engine_name in engine_order:
             engine = self._search_engine[engine_name]
             try:
-                links = await self._perform_search_with_engine(engine, query, num_results)
+                links = await self._perform_search_with_engine(
+                    engine, query, num_results
+                )
                 if links:
                     return links
             except Exception as e:
                 print(f"Search engine '{engine_name}' failed with error: {e}")
         return []
-    
+
     def _get_engine_order(self) -> List[str]:
         """
         Determines the order in which to try search engines.
@@ -78,18 +82,18 @@ class WebSearch(BaseTool):
             if key not in engine_order:
                 engine_order.append(key)
         return engine_order
-    
+
     @retry(
         stop=stop_after_attempt(3),
         wait=wait_exponential(multiplier=1, min=1, max=10),
     )
     async def _perform_search_with_engine(
-        self, 
-        engine: WebSearchEngine, 
-        query: str, 
+        self,
+        engine: WebSearchEngine,
+        query: str,
         num_results: int,
     ) -> List[str]:
         loop = asyncio.get_event_loop()
         return await loop.run_in_executor(
             None, lambda: list(engine.perform_search(query, num_results=num_results))
-        )
\ No newline at end of file
+        )
diff --git a/config/config.example.toml b/config/config.example.toml
index de02853..2eecdfb 100644
--- a/config/config.example.toml
+++ b/config/config.example.toml
@@ -1,6 +1,6 @@
 # Global LLM configuration
 [llm]
-model = "claude-3-7-sonnet"            # The LLM model to use
+model = "gpt-4o"                       # The LLM model to use
 base_url = "https://api.openai.com/v1" # API endpoint URL
 api_key = "sk-..."                     # Your API key
 max_tokens = 8192                      # Maximum number of tokens in the response
@@ -26,7 +26,7 @@ temperature = 0.0                      # Controls randomness
 
 # Optional configuration for specific LLM models
 [llm.vision]
-model = "claude-3-7-sonnet"            # The vision model to use
+model = "gpt-4o"                       # The vision model to use
 base_url = "https://api.openai.com/v1" # API endpoint URL for vision model
 api_key = "sk-..."                     # Your API key for vision model
 max_tokens = 8192                      # Maximum number of tokens in the response