diff --git a/nanda_adapter/core/agent_bridge.py b/nanda_adapter/core/agent_bridge.py
index 26361d6..a223ea3 100644
--- a/nanda_adapter/core/agent_bridge.py
+++ b/nanda_adapter/core/agent_bridge.py
@@ -170,7 +170,7 @@ def call_claude(prompt: str, additional_context: str, conversation_id: str, curr
         agent_id = get_agent_id()
         print(f"Agent {agent_id}: Calling Claude with prompt: {full_prompt[:50]}...")
         resp = anthropic.messages.create(
-            model="claude-3-5-sonnet-20241022",
+            model="claude-sonnet-4-20250514",
             max_tokens=512,
             messages=[{"role":"user","content":full_prompt}],
             system=system
@@ -202,7 +202,7 @@ def call_claude_direct(message_text: str, system_prompt: str = None) -> Optional
         agent_id = get_agent_id()
         print(f"Agent {agent_id}: Calling Claude with prompt: {full_prompt[:50]}...")
         resp = anthropic.messages.create(
-            model="claude-3-5-sonnet-20241022",
+            model="claude-sonnet-4-20250514",
             max_tokens=512,
             messages=[{"role":"user","content":full_prompt}],
             system=system_prompt
diff --git a/nanda_adapter/core/mcp_utils.py b/nanda_adapter/core/mcp_utils.py
index 6042c28..9a56e96 100644
--- a/nanda_adapter/core/mcp_utils.py
+++ b/nanda_adapter/core/mcp_utils.py
@@ -91,7 +91,7 @@ async def process_query(self, query, mcp_server_url, transport_type="http"):
             
             # Call Claude API
             message = self.anthropic.messages.create(
-                model="claude-3-5-sonnet-20241022",
+                model="claude-sonnet-4-20250514",
                 max_tokens=1024,
                 messages=messages,
                 tools=available_tools
@@ -148,7 +148,7 @@ async def process_query(self, query, mcp_server_url, transport_type="http"):
                 print("Getting next response from Claude...")
                 # Get next response from Claude
                 message = self.anthropic.messages.create(
-                    model="claude-3-5-sonnet-20241022",
+                    model="claude-sonnet-4-20250514",
                     max_tokens=1024,
                     messages=messages,
                     tools=available_tools