diff --git a/lib/openai/cursor_page.rb b/lib/openai/cursor_page.rb
index 9ee3cd79..92a6b024 100644
--- a/lib/openai/cursor_page.rb
+++ b/lib/openai/cursor_page.rb
@@ -30,7 +30,7 @@ module OpenAI
   class CursorPage
     include OpenAI::BasePage
 
-    # @return [Array<Object>]
+    # @return [Array<Object>, nil]
     attr_accessor :data
 
     # @return [Boolean]
diff --git a/lib/openai/errors.rb b/lib/openai/errors.rb
index 90cebc97..7a4228e8 100644
--- a/lib/openai/errors.rb
+++ b/lib/openai/errors.rb
@@ -4,7 +4,7 @@ module OpenAI
   class Error < StandardError
     # @!parse
     #   # @return [StandardError, nil]
-    #   attr_reader :cause
+    #   attr_accessor :cause
   end
 
   class ConversionError < OpenAI::Error
@@ -12,22 +12,22 @@ class ConversionError < OpenAI::Error
 
   class APIError < OpenAI::Error
     # @return [URI::Generic]
-    attr_reader :url
+    attr_accessor :url
 
     # @return [Integer, nil]
-    attr_reader :status
+    attr_accessor :status
 
     # @return [Object, nil]
-    attr_reader :body
+    attr_accessor :body
 
     # @return [String, nil]
-    attr_reader :code
+    attr_accessor :code
 
     # @return [String, nil]
-    attr_reader :param
+    attr_accessor :param
 
     # @return [String, nil]
-    attr_reader :type
+    attr_accessor :type
 
     # @api private
     #
@@ -50,23 +50,23 @@ def initialize(url:, status: nil, body: nil, request: nil, response: nil, messag
   class APIConnectionError < OpenAI::APIError
     # @!parse
     #   # @return [nil]
-    #   attr_reader :status
+    #   attr_accessor :status
 
     # @!parse
     #   # @return [nil]
-    #   attr_reader :body
+    #   attr_accessor :body
 
     # @!parse
     #   # @return [nil]
-    #   attr_reader :code
+    #   attr_accessor :code
 
     # @!parse
     #   # @return [nil]
-    #   attr_reader :param
+    #   attr_accessor :param
 
     # @!parse
     #   # @return [nil]
-    #   attr_reader :type
+    #   attr_accessor :type
 
     # @api private
     #
@@ -147,19 +147,19 @@ def self.for(url:, status:, body:, request:, response:, message: nil)
 
     # @!parse
     #   # @return [Integer]
-    #   attr_reader :status
+    #   attr_accessor :status
 
     # @!parse
     #   # @return [String, nil]
-    #   attr_reader :code
+    #   attr_accessor :code
 
     # @!parse
     #   # @return [String, nil]
-    #   attr_reader :param
+    #   attr_accessor :param
 
     # @!parse
     #   # @return [String, nil]
-    #   attr_reader :type
+    #   attr_accessor :type
 
     # @api private
     #
diff --git a/lib/openai/page.rb b/lib/openai/page.rb
index 55b56fe4..40ccc49a 100644
--- a/lib/openai/page.rb
+++ b/lib/openai/page.rb
@@ -30,7 +30,7 @@ module OpenAI
   class Page
     include OpenAI::BasePage
 
-    # @return [Array<Object>]
+    # @return [Array<Object>, nil]
     attr_accessor :data
 
     # @return [String]
@@ -53,7 +53,7 @@ def initialize(client:, req:, headers:, page_data:)
       end
 
       case page_data
-      in {object: String | nil => object}
+      in {object: String => object}
         @object = object
       else
       end
diff --git a/rbi/lib/openai/cursor_page.rbi b/rbi/lib/openai/cursor_page.rbi
index a489a9ff..c40bab43 100644
--- a/rbi/lib/openai/cursor_page.rbi
+++ b/rbi/lib/openai/cursor_page.rbi
@@ -6,11 +6,11 @@ module OpenAI
 
     Elem = type_member
 
-    sig { returns(T::Array[Elem]) }
+    sig { returns(T.nilable(T::Array[Elem])) }
     def data
     end
 
-    sig { params(_: T::Array[Elem]).returns(T::Array[Elem]) }
+    sig { params(_: T.nilable(T::Array[Elem])).returns(T.nilable(T::Array[Elem])) }
     def data=(_)
     end
 
diff --git a/rbi/lib/openai/errors.rbi b/rbi/lib/openai/errors.rbi
index 1408d718..56d79f0b 100644
--- a/rbi/lib/openai/errors.rbi
+++ b/rbi/lib/openai/errors.rbi
@@ -5,6 +5,10 @@ module OpenAI
     sig { returns(T.nilable(StandardError)) }
     def cause
     end
+
+    sig { params(_: T.nilable(StandardError)).returns(T.nilable(StandardError)) }
+    def cause=(_)
+    end
   end
 
   class ConversionError < OpenAI::Error
@@ -15,26 +19,50 @@ module OpenAI
     def url
     end
 
+    sig { params(_: URI::Generic).returns(URI::Generic) }
+    def url=(_)
+    end
+
     sig { returns(T.nilable(Integer)) }
     def status
     end
 
+    sig { params(_: T.nilable(Integer)).returns(T.nilable(Integer)) }
+    def status=(_)
+    end
+
     sig { returns(T.nilable(T.anything)) }
     def body
     end
 
+    sig { params(_: T.nilable(T.anything)).returns(T.nilable(T.anything)) }
+    def body=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def code
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def code=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def param
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def param=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def type
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def type=(_)
+    end
+
     # @api private
     sig do
       params(
@@ -56,22 +84,42 @@ module OpenAI
     def status
     end
 
+    sig { params(_: NilClass).void }
+    def status=(_)
+    end
+
     sig { void }
     def body
     end
 
+    sig { params(_: NilClass).void }
+    def body=(_)
+    end
+
     sig { void }
     def code
     end
 
+    sig { params(_: NilClass).void }
+    def code=(_)
+    end
+
     sig { void }
     def param
     end
 
+    sig { params(_: NilClass).void }
+    def param=(_)
+    end
+
     sig { void }
     def type
     end
 
+    sig { params(_: NilClass).void }
+    def type=(_)
+    end
+
     # @api private
     sig do
       params(
@@ -125,18 +173,34 @@ module OpenAI
     def status
     end
 
+    sig { params(_: Integer).returns(Integer) }
+    def status=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def code
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def code=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def param
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def param=(_)
+    end
+
     sig { returns(T.nilable(String)) }
     def type
     end
 
+    sig { params(_: T.nilable(String)).returns(T.nilable(String)) }
+    def type=(_)
+    end
+
     # @api private
     sig do
       params(
diff --git a/rbi/lib/openai/page.rbi b/rbi/lib/openai/page.rbi
index 3b8ff55d..a738bab8 100644
--- a/rbi/lib/openai/page.rbi
+++ b/rbi/lib/openai/page.rbi
@@ -6,11 +6,11 @@ module OpenAI
 
     Elem = type_member
 
-    sig { returns(T::Array[Elem]) }
+    sig { returns(T.nilable(T::Array[Elem])) }
     def data
     end
 
-    sig { params(_: T::Array[Elem]).returns(T::Array[Elem]) }
+    sig { params(_: T.nilable(T::Array[Elem])).returns(T.nilable(T::Array[Elem])) }
     def data=(_)
     end
 
diff --git a/sig/openai/cursor_page.rbs b/sig/openai/cursor_page.rbs
index 3d313782..5aa7c659 100644
--- a/sig/openai/cursor_page.rbs
+++ b/sig/openai/cursor_page.rbs
@@ -2,7 +2,7 @@ module OpenAI
   class CursorPage[Elem]
     include OpenAI::BasePage[Elem]
 
-    attr_accessor data: ::Array[Elem]
+    attr_accessor data: ::Array[Elem]?
 
     attr_accessor has_more: bool
   end
diff --git a/sig/openai/errors.rbs b/sig/openai/errors.rbs
index 08f05bd0..b5c00826 100644
--- a/sig/openai/errors.rbs
+++ b/sig/openai/errors.rbs
@@ -1,23 +1,23 @@
 module OpenAI
   class Error < StandardError
-    attr_reader cause: StandardError?
+    attr_accessor cause: StandardError?
   end
 
   class ConversionError < OpenAI::Error
   end
 
   class APIError < OpenAI::Error
-    attr_reader url: URI::Generic
+    attr_accessor url: URI::Generic
 
-    attr_reader status: Integer?
+    attr_accessor status: Integer?
 
-    attr_reader body: top?
+    attr_accessor body: top?
 
-    attr_reader code: String?
+    attr_accessor code: String?
 
-    attr_reader param: String?
+    attr_accessor param: String?
 
-    attr_reader type: String?
+    attr_accessor type: String?
 
     def initialize: (
       url: URI::Generic,
diff --git a/sig/openai/page.rbs b/sig/openai/page.rbs
index 37846820..420e2716 100644
--- a/sig/openai/page.rbs
+++ b/sig/openai/page.rbs
@@ -2,7 +2,7 @@ module OpenAI
   class Page[Elem]
     include OpenAI::BasePage[Elem]
 
-    attr_accessor data: ::Array[Elem]
+    attr_accessor data: ::Array[Elem]?
 
     attr_accessor object: String
   end