diff --git a/lib/openai/models/chat/chat_completion_message_function_tool_call.rb b/lib/openai/models/chat/chat_completion_message_function_tool_call.rb
index a9514a10..3cd8808a 100644
--- a/lib/openai/models/chat/chat_completion_message_function_tool_call.rb
+++ b/lib/openai/models/chat/chat_completion_message_function_tool_call.rb
@@ -42,6 +42,12 @@ class Function < OpenAI::Internal::Type::BaseModel
           #   @return [String]
           required :arguments, String
 
+          # @!attribute parsed
+          #   The parsed contents of the arguments.
+          #
+          #   @return [Object, nil]
+          required :parsed, OpenAI::StructuredOutput::ParsedJson
+
           # @!attribute name
           #   The name of the function to call.
           #
diff --git a/rbi/openai/models/chat/chat_completion_message_function_tool_call.rbi b/rbi/openai/models/chat/chat_completion_message_function_tool_call.rbi
index a6d11892..d62f0f17 100644
--- a/rbi/openai/models/chat/chat_completion_message_function_tool_call.rbi
+++ b/rbi/openai/models/chat/chat_completion_message_function_tool_call.rbi
@@ -85,6 +85,10 @@ module OpenAI
           sig { returns(String) }
           attr_accessor :arguments
 
+          # The parsed contents of the arguments.
+          sig { returns(T.anything) }
+          attr_accessor :parsed
+
           # The name of the function to call.
           sig { returns(String) }
           attr_accessor :name
diff --git a/rbi/openai/resources/responses.rbi b/rbi/openai/resources/responses.rbi
index e25d90d2..7a2577b3 100644
--- a/rbi/openai/resources/responses.rbi
+++ b/rbi/openai/resources/responses.rbi
@@ -591,7 +591,6 @@ module OpenAI
                   OpenAI::Responses::Tool::CodeInterpreter::OrHash,
                   OpenAI::Responses::Tool::ImageGeneration::OrHash,
                   OpenAI::Responses::Tool::LocalShell::OrHash,
-                  OpenAI::Responses::Tool::Custom::OrHash,
                   OpenAI::Responses::WebSearchTool::OrHash
                 )
               ]