diff --git a/lib/agent_loop.py b/lib/agent_loop.py
index cdbef1a..c924fae 100644
--- a/lib/agent_loop.py
+++ b/lib/agent_loop.py
@@ -27,7 +27,13 @@ def execute_tool(tool_call, TOOL_HANDLERS):
 def run_agent_loop(session, llm_client, TOOLS, TOOL_HANDLERS, max_iterations, on_tool_calls=None):
     for step in range(max_iterations):
         print(f'[{_ts()}] Step {step + 1} — calling LLM...', flush=True)
-        response = llm_client.chat(session.messages, tools=TOOLS)
+        
+        # Ambil konfigurasi disable_reasoning dari personality karakter
+        # Default ke False jika tidak didefinisikan
+        personality = getattr(session, 'personality', {})
+        disable_reasoning = personality.get('disable_reasoning', False)
+        
+        response = llm_client.chat(session.messages, tools=TOOLS, disable_reasoning=disable_reasoning)
 
         if response.tool_calls:
             amsg = {
diff --git a/services/llm_client.py b/services/llm_client.py
index ec0df4a..c19046c 100644
--- a/services/llm_client.py
+++ b/services/llm_client.py
@@ -19,7 +19,7 @@ class LLMClient:
         self.timeout = timeout
         self.cancel_requested = False
 
-    def chat(self, messages, tools=None, on_stream_chunk=None):
+    def chat(self, messages, tools=None, on_stream_chunk=None, disable_reasoning=False):
         url = f"{self.base_url}/chat/completions"
         payload = {
             "model": self.model,
@@ -30,9 +30,10 @@ class LLMClient:
             payload["tools"] = tools
             payload["tool_choice"] = "auto"
 
-        # Disable reasoning/thinking di level API bila didukung
-        # OpenRouter & beberapa provider support ini
-        payload["reasoning"] = {"enabled": False}
+        # Hanya kirim parameter reasoning jika diminta eksplisit
+        # Beberapa model/provider justru error jika parameter ini ada tapi tidak didukung
+        if disable_reasoning:
+            payload["reasoning"] = {"enabled": False}
 
         data = json.dumps(payload).encode('utf-8')
         req = urllib.request.Request(url, data=data, method='POST')
@@ -102,11 +103,11 @@ class LLMClient:
 
                     # Stream content (text response)
                     if 'content' in delta:
-                        chunk_text = delta['content']
+                        chunk_text = delta['content'] or ""
                         full_content += chunk_text
 
                         # Callback untuk streaming ke UI
-                        if on_stream_chunk:
+                        if on_stream_chunk and chunk_text:
                             on_stream_chunk(chunk_text)
 
             # Build final response