diff --git a/src/agents/extensions/models/litellm_model.py b/src/agents/extensions/models/litellm_model.py
index 301e06b3d..055df15a3 100644
--- a/src/agents/extensions/models/litellm_model.py
+++ b/src/agents/extensions/models/litellm_model.py
@@ -269,7 +269,7 @@ async def _fetch_response(
         )
 
         # Fix for interleaved thinking bug: reorder messages to ensure tool_use comes before tool_result  # noqa: E501
-        if preserve_thinking_blocks:
+        if 'anthropic' in self.model.lower() or 'claude' in self.model.lower():
             converted_messages = self._fix_tool_message_ordering(converted_messages)
 
         if system_instructions: