diff --git a/lib/crewai/src/crewai/utilities/agent_utils.py b/lib/crewai/src/crewai/utilities/agent_utils.py
index 91cfbb6db..545305d23 100644
--- a/lib/crewai/src/crewai/utilities/agent_utils.py
+++ b/lib/crewai/src/crewai/utilities/agent_utils.py
@@ -1228,7 +1228,14 @@ def extract_tool_call_info(
         )
         func_info = tool_call.get("function", {})
         func_name = func_info.get("name", "") or tool_call.get("name", "")
-        func_args = func_info.get("arguments") or tool_call.get("input") or {}
+        # OpenAI Responses API function_call items are flat dicts using
+        # "arguments" (not "input") with no nested "function" key.
+        func_args = (
+            func_info.get("arguments")
+            or tool_call.get("arguments")
+            or tool_call.get("input")
+            or {}
+        )
         return call_id, sanitize_tool_name(func_name), func_args
     return None
 
@@ -1260,6 +1267,13 @@ def is_tool_call_list(response: list[Any]) -> bool:
     # Bedrock-style
     if isinstance(first_item, dict) and "name" in first_item and "input" in first_item:
         return True
+    # OpenAI Responses API-style (flat dict, no nested "function" key)
+    if (
+        isinstance(first_item, dict)
+        and "name" in first_item
+        and "arguments" in first_item
+    ):
+        return True
     # Gemini-style
     if hasattr(first_item, "function_call") and first_item.function_call:
         return True