🚀 Upgrade to Claude Sonnet 4 (claude-sonnet-4-20250514) with enhanced reasoning and refusal handling

langgraph_agent.py

@@ -114,10 +114,16 @@ def call_claude(prompt: str, max_tokens: int = 100) -> str:
     
     try:
         response = claude_client.messages.create(
-            model="claude-3-haiku-20240307",  # Fast and cheap
+            model="claude-sonnet-4-20250514",  # Latest Claude 4 model
             max_tokens=max_tokens,
             messages=[{"role": "user", "content": prompt}]
         )
+        
+        # Handle Claude 4 refusal stop reason
+        if hasattr(response, 'stop_reason') and response.stop_reason == "refusal":
+            print(f"Claude refused to answer: {response.content[0].text if response.content else 'No content'}")
+            return ""
+            
         return response.content[0].text.strip()
     except Exception as e:
         print(f"Claude API error: {e}")

tools.py

@@ -94,7 +94,7 @@ def web_search_clean(query: str, max_results: int = 3) -> List[str]:
     try:
         # Use Claude's built-in web search tool
         response = claude_client.messages.create(
-            model="claude-3-5-sonnet-20241022",  # Use latest model that supports web search
+            model="claude-sonnet-4-20250514",  # Latest Claude 4 model with web search
             max_tokens=1500,
             messages=[{
                 "role": "user",
@@ -107,6 +107,11 @@ def web_search_clean(query: str, max_results: int = 3) -> List[str]:
             }]
         )
         
+        # Handle Claude 4 refusal stop reason
+        if hasattr(response, 'stop_reason') and response.stop_reason == "refusal":
+            print("❌ Claude refused web search request")
+            return []
+            
         # Extract the search results from Claude's response
         if not response.content:
             print("❌ No content in Claude's web search response")
@@ -295,7 +300,7 @@ Be precise and factual."""
         
         # Send request to Claude with vision
         response = claude_client.messages.create(
-            model="claude-3-5-sonnet-20241022",
+            model="claude-sonnet-4-20250514",
             max_tokens=500,
             messages=[{
                 "role": "user",
@@ -316,6 +321,10 @@ Be precise and factual."""
             }]
         )
         
+        # Handle Claude 4 refusal stop reason
+        if hasattr(response, 'stop_reason') and response.stop_reason == "refusal":
+            return "Claude refused to analyze this image for safety reasons"
+            
         # Extract response text
         if response.content and len(response.content) > 0:
             return response.content[0].text.strip()