diff --git a/openhands/llm/llm.py b/openhands/llm/llm.py
index a3a775ca69..62b0f94acc 100644
--- a/openhands/llm/llm.py
+++ b/openhands/llm/llm.py
@@ -94,6 +94,7 @@ FUNCTION_CALLING_SUPPORTED_MODELS = [
     'kimi-k2-instruct',
     'Qwen3-Coder-480B-A35B-Instruct',
     'qwen3-coder',  # this will match both qwen3-coder-480b (openhands provider) and qwen3-coder (for openrouter)
+    'gpt-5',
     'gpt-5-2025-08-07',
 ]
 
@@ -108,7 +109,9 @@ REASONING_EFFORT_SUPPORTED_MODELS = [
     'o4-mini-2025-04-16',
     'gemini-2.5-flash',
     'gemini-2.5-pro',
+    'gpt-5',
     'gpt-5-2025-08-07',
+    'claude-opus-4-1-20250805',  # we need to remove top_p for opus 4.1
 ]
 
 MODELS_WITHOUT_STOP_WORDS = [