diff --git a/openhands/llm/model_features.py b/openhands/llm/model_features.py
index caab21277c..a9857ffaca 100644
--- a/openhands/llm/model_features.py
+++ b/openhands/llm/model_features.py
@@ -89,6 +89,7 @@ FUNCTION_CALLING_PATTERNS: list[str] = [
     'qwen3-coder*',
     'qwen3-coder-480b-a35b-instruct',
     'deepseek-chat',
+    'grok-code-fast-1',
 ]
 
 REASONING_EFFORT_PATTERNS: list[str] = [