diff --git a/lib/openai/base_client.rb b/lib/openai/base_client.rb
index 5c609ac7..b5cc5490 100644
--- a/lib/openai/base_client.rb
+++ b/lib/openai/base_client.rb
@@ -124,6 +124,20 @@ def follow_redirect(request, status:, response_headers:)
 
         request
       end
+
+      # @api private
+      #
+      # @param status [Integer, OpenAI::APIConnectionError]
+      # @param stream [Enumerable, nil]
+      def reap_connection!(status, stream:)
+        case status
+        in (..199) | (300..499)
+          stream&.each { next }
+        in OpenAI::APIConnectionError | (500..)
+          OpenAI::Util.close_fused!(stream)
+        else
+        end
+      end
     end
 
     # @api private
@@ -321,28 +335,23 @@ def initialize(
       end
 
       begin
-        response, stream = @requester.execute(input)
-        status = Integer(response.code)
+        status, response, stream = @requester.execute(input)
       rescue OpenAI::APIConnectionError => e
         status = e
       end
 
-      # normally we want to drain the response body and reuse the HTTP session by clearing the socket buffers
-      # unless we hit a server error
-      srv_fault = (500...).include?(status)
-
       case status
       in ..299
         [status, response, stream]
       in 300..399 if redirect_count >= self.class::MAX_REDIRECTS
-        message = "Failed to complete the request within #{self.class::MAX_REDIRECTS} redirects."
+        self.class.reap_connection!(status, stream: stream)
 
-        stream.each { next }
+        message = "Failed to complete the request within #{self.class::MAX_REDIRECTS} redirects."
         raise OpenAI::APIConnectionError.new(url: url, message: message)
       in 300..399
-        request = self.class.follow_redirect(request, status: status, response_headers: response)
+        self.class.reap_connection!(status, stream: stream)
 
-        stream.each { next }
+        request = self.class.follow_redirect(request, status: status, response_headers: response)
         send_request(
           request,
           redirect_count: redirect_count + 1,
@@ -352,12 +361,10 @@ def initialize(
       in OpenAI::APIConnectionError if retry_count >= max_retries
         raise status
       in (400..) if retry_count >= max_retries || !self.class.should_retry?(status, headers: response)
-        decoded = OpenAI::Util.decode_content(response, stream: stream, suppress_error: true)
-
-        if srv_fault
-          OpenAI::Util.close_fused!(stream)
-        else
-          stream.each { next }
+        decoded = Kernel.then do
+          OpenAI::Util.decode_content(response, stream: stream, suppress_error: true)
+        ensure
+          self.class.reap_connection!(status, stream: stream)
         end
 
         raise OpenAI::APIStatusError.for(
@@ -368,13 +375,9 @@ def initialize(
           response: response
         )
       in (400..) | OpenAI::APIConnectionError
-        delay = retry_delay(response, retry_count: retry_count)
+        self.class.reap_connection!(status, stream: stream)
 
-        if srv_fault
-          OpenAI::Util.close_fused!(stream)
-        else
-          stream&.each { next }
-        end
+        delay = retry_delay(response, retry_count: retry_count)
         sleep(delay)
 
         send_request(
diff --git a/lib/openai/cursor_page.rb b/lib/openai/cursor_page.rb
index 92a6b024..35b585e9 100644
--- a/lib/openai/cursor_page.rb
+++ b/lib/openai/cursor_page.rb
@@ -68,7 +68,8 @@ def next_page?
     # @return [OpenAI::CursorPage]
     def next_page
       unless next_page?
-        raise RuntimeError.new("No more pages available. Please check #next_page? before calling ##{__method__}")
+        message = "No more pages available. Please check #next_page? before calling ##{__method__}"
+        raise RuntimeError.new(message)
       end
 
       req = OpenAI::Util.deep_merge(@req, {query: {after: data&.last&.id}})
diff --git a/lib/openai/pooled_net_requester.rb b/lib/openai/pooled_net_requester.rb
index 0e16cc88..4b0ae742 100644
--- a/lib/openai/pooled_net_requester.rb
+++ b/lib/openai/pooled_net_requester.rb
@@ -61,6 +61,7 @@ def build_request(request, &)
 
         case body
         in nil
+          nil
         in String
           req["content-length"] ||= body.bytesize.to_s unless req["transfer-encoding"]
           req.body_stream = OpenAI::Util::ReadIOAdapter.new(body, &)
@@ -79,9 +80,11 @@ def build_request(request, &)
     # @api private
     #
     # @param url [URI::Generic]
+    # @param deadline [Float]
     # @param blk [Proc]
-    private def with_pool(url, &)
+    private def with_pool(url, deadline:, &blk)
       origin = OpenAI::Util.uri_origin(url)
+      timeout = deadline - OpenAI::Util.monotonic_secs
       pool =
         @mutex.synchronize do
           @pools[origin] ||= ConnectionPool.new(size: @size) do
@@ -89,7 +92,7 @@ def build_request(request, &)
           end
         end
 
-      pool.with(&)
+      pool.with(timeout: timeout, &blk)
     end
 
     # @api private
@@ -106,14 +109,14 @@ def build_request(request, &)
     #
     #   @option request [Float] :deadline
     #
-    # @return [Array(Net::HTTPResponse, Enumerable)]
+    # @return [Array(Integer, Net::HTTPResponse, Enumerable)]
     def execute(request)
       url, deadline = request.fetch_values(:url, :deadline)
 
       eof = false
       finished = false
       enum = Enumerator.new do |y|
-        with_pool(url) do |conn|
+        with_pool(url, deadline: deadline) do |conn|
           next if finished
 
           req = self.class.build_request(request) do
@@ -125,7 +128,7 @@ def execute(request)
 
           self.class.calibrate_socket_timeout(conn, deadline)
           conn.request(req) do |rsp|
-            y << [conn, rsp]
+            y << [conn, req, rsp]
             break if finished
 
             rsp.read_body do |bytes|
@@ -137,9 +140,11 @@ def execute(request)
             eof = true
           end
         end
+      rescue Timeout::Error
+        raise OpenAI::APITimeoutError
       end
 
-      conn, response = enum.next
+      conn, _, response = enum.next
       body = OpenAI::Util.fused_enum(enum, external: true) do
         finished = true
         tap do
@@ -149,7 +154,7 @@ def execute(request)
         end
         conn.finish if !eof && conn&.started?
       end
-      [response, (response.body = body)]
+      [Integer(response.code), response, (response.body = body)]
     end
 
     # @api private
diff --git a/lib/openai/util.rb b/lib/openai/util.rb
index 2f4fecde..ef208d81 100644
--- a/lib/openai/util.rb
+++ b/lib/openai/util.rb
@@ -57,7 +57,7 @@ class << self
       #
       # @param input [Object]
       #
-      # @return [Boolean, Object]
+      # @return [Boolean]
       def primitive?(input)
         case input
         in true | false | Integer | Float | Symbol | String
@@ -627,6 +627,8 @@ def close_fused!(enum)
       #
       # @param enum [Enumerable, nil]
       # @param blk [Proc]
+      #
+      # @return [Enumerable]
       def chain_fused(enum, &blk)
         iter = Enumerator.new { blk.call(_1) }
         fused_enum(iter) { close_fused!(enum) }
diff --git a/rbi/lib/openai/base_client.rbi b/rbi/lib/openai/base_client.rbi
index 85abd5cb..6b76b254 100644
--- a/rbi/lib/openai/base_client.rbi
+++ b/rbi/lib/openai/base_client.rbi
@@ -67,6 +67,16 @@ module OpenAI
       end
       def follow_redirect(request, status:, response_headers:)
       end
+
+      # @api private
+      sig do
+        params(
+          status: T.any(Integer, OpenAI::APIConnectionError),
+          stream: T.nilable(T::Enumerable[String])
+        ).void
+      end
+      def reap_connection!(status, stream:)
+      end
     end
 
     sig { returns(T.anything) }
diff --git a/rbi/lib/openai/base_model.rbi b/rbi/lib/openai/base_model.rbi
index 3a7913f6..06bae256 100644
--- a/rbi/lib/openai/base_model.rbi
+++ b/rbi/lib/openai/base_model.rbi
@@ -228,7 +228,7 @@ module OpenAI
       # @api private
       #
       # All of the specified variant info for this union.
-      sig { returns(T::Array[[T.nilable(Symbol), Proc]]) }
+      sig { returns(T::Array[[T.nilable(Symbol), T.proc.returns(Variants)]]) }
       private def known_variants
       end
 
@@ -250,17 +250,8 @@ module OpenAI
       # @api private
       sig do
         params(
-          key: T.any(
-            Symbol,
-            T::Hash[Symbol, T.anything],
-            T.proc.returns(OpenAI::Converter::Input),
-            OpenAI::Converter::Input
-          ),
-          spec: T.any(
-            T::Hash[Symbol, T.anything],
-            T.proc.returns(OpenAI::Converter::Input),
-            OpenAI::Converter::Input
-          )
+          key: T.any(Symbol, T::Hash[Symbol, T.anything], T.proc.returns(Variants), Variants),
+          spec: T.any(T::Hash[Symbol, T.anything], T.proc.returns(Variants), Variants)
         )
           .void
       end
@@ -268,7 +259,7 @@ module OpenAI
       end
 
       # @api private
-      sig { params(value: T.anything).returns(T.nilable(OpenAI::Converter::Input)) }
+      sig { params(value: T.anything).returns(T.nilable(Variants)) }
       private def resolve_variant(value)
       end
     end
diff --git a/rbi/lib/openai/pooled_net_requester.rbi b/rbi/lib/openai/pooled_net_requester.rbi
index e940c4f4..9297bdea 100644
--- a/rbi/lib/openai/pooled_net_requester.rbi
+++ b/rbi/lib/openai/pooled_net_requester.rbi
@@ -27,14 +27,14 @@ module OpenAI
     end
 
     # @api private
-    sig { params(url: URI::Generic, blk: T.proc.params(arg0: Net::HTTP).void).void }
-    private def with_pool(url, &blk)
+    sig { params(url: URI::Generic, deadline: Float, blk: T.proc.params(arg0: Net::HTTP).void).void }
+    private def with_pool(url, deadline:, &blk)
     end
 
     # @api private
     sig do
       params(request: OpenAI::PooledNetRequester::RequestShape)
-        .returns([Net::HTTPResponse, T::Enumerable[String]])
+        .returns([Integer, Net::HTTPResponse, T::Enumerable[String]])
     end
     def execute(request)
     end
diff --git a/rbi/lib/openai/util.rbi b/rbi/lib/openai/util.rbi
index 8faebf37..22824de5 100644
--- a/rbi/lib/openai/util.rbi
+++ b/rbi/lib/openai/util.rbi
@@ -22,7 +22,7 @@ module OpenAI
 
     class << self
       # @api private
-      sig { params(input: T.anything).returns(T.any(T::Boolean, T.anything)) }
+      sig { params(input: T.anything).returns(T::Boolean) }
       def primitive?(input)
       end
 
@@ -239,10 +239,8 @@ module OpenAI
 
       # @api private
       sig do
-        params(
-          enum: T.nilable(T::Enumerable[T.anything]),
-          blk: T.proc.params(arg0: Enumerator::Yielder).void
-        ).void
+        params(enum: T.nilable(T::Enumerable[T.anything]), blk: T.proc.params(arg0: Enumerator::Yielder).void)
+          .returns(T::Enumerable[T.anything])
       end
       def chain_fused(enum, &blk)
       end
diff --git a/sig/openai/base_client.rbs b/sig/openai/base_client.rbs
index d685733f..0c19b54e 100644
--- a/sig/openai/base_client.rbs
+++ b/sig/openai/base_client.rbs
@@ -43,6 +43,11 @@ module OpenAI
       response_headers: ::Hash[String, String]
     ) -> OpenAI::BaseClient::request_input
 
+    def self.reap_connection!: (
+      Integer | OpenAI::APIConnectionError status,
+      stream: Enumerable[String]?
+    ) -> void
+
     # @api private
     attr_accessor requester: top
 
diff --git a/sig/openai/base_model.rbs b/sig/openai/base_model.rbs
index 857d4573..574847b4 100644
--- a/sig/openai/base_model.rbs
+++ b/sig/openai/base_model.rbs
@@ -85,7 +85,7 @@ module OpenAI
   class Union
     extend OpenAI::Converter
 
-    private def self.known_variants: -> ::Array[[Symbol?, Proc]]
+    private def self.known_variants: -> ::Array[[Symbol?, (^-> OpenAI::Converter::input)]]
 
     def self.derefed_variants: -> ::Array[[Symbol?, top]]
 
diff --git a/sig/openai/pooled_net_requester.rbs b/sig/openai/pooled_net_requester.rbs
index 9e7daafb..c9f6520d 100644
--- a/sig/openai/pooled_net_requester.rbs
+++ b/sig/openai/pooled_net_requester.rbs
@@ -19,11 +19,16 @@ module OpenAI
       (String arg0) -> void
     } -> top
 
-    private def with_pool: (URI::Generic url) { (top arg0) -> void } -> void
+    private def with_pool: (
+      URI::Generic url,
+      deadline: Float
+    ) {
+      (top arg0) -> void
+    } -> void
 
     def execute: (
       OpenAI::PooledNetRequester::request request
-    ) -> [top, Enumerable[String]]
+    ) -> [Integer, top, Enumerable[String]]
 
     def initialize: (size: Integer) -> void
   end
diff --git a/sig/openai/util.rbs b/sig/openai/util.rbs
index 065ab7d1..375f8324 100644
--- a/sig/openai/util.rbs
+++ b/sig/openai/util.rbs
@@ -6,7 +6,7 @@ module OpenAI
 
     def self?.os: -> String
 
-    def self?.primitive?: (top input) -> (bool | top)
+    def self?.primitive?: (top input) -> bool
 
     def self?.coerce_boolean: (top input) -> (bool | top)
 
@@ -118,7 +118,7 @@ module OpenAI
       Enumerable[top]? enum
     ) {
       (Enumerator::Yielder arg0) -> void
-    } -> void
+    } -> Enumerable[top]
 
     type server_sent_event =
       { event: String?, data: String?, id: String?, retry: Integer? }
diff --git a/test/openai/client_test.rb b/test/openai/client_test.rb
index 4147e2ac..7d0758fa 100644
--- a/test/openai/client_test.rb
+++ b/test/openai/client_test.rb
@@ -18,32 +18,6 @@ def test_raises_on_missing_non_nullable_opts
     assert_match(/is required/, e.message)
   end
 
-  class MockResponse
-    # @return [Integer]
-    attr_reader :code
-
-    # @param code [Integer]
-    # @param headers [Hash{String=>String}]
-    def initialize(code, headers)
-      @code = code
-      @headers = {"content-type" => "application/json", **headers}
-    end
-
-    # @param header [String]
-    #
-    # @return [String, nil]
-    def [](header)
-      @headers[header]
-    end
-
-    # @param header [String]
-    #
-    # @return [Boolean]
-    def key?(header)
-      @headers.key?(header)
-    end
-  end
-
   class MockRequester
     # @return [Integer]
     attr_reader :response_code
@@ -71,7 +45,8 @@ def initialize(response_code, response_headers, response_data)
     def execute(req)
       # Deep copy the request because it is mutated on each retry.
       attempts.push(Marshal.load(Marshal.dump(req)))
-      [MockResponse.new(response_code, response_headers), response_data.grapheme_clusters]
+      headers = {"content-type" => "application/json", **response_headers}
+      [response_code, headers, response_data.grapheme_clusters]
     end
   end
 
diff --git a/test/openai/util_test.rb b/test/openai/util_test.rb
index d319e2f9..476e16af 100644
--- a/test/openai/util_test.rb
+++ b/test/openai/util_test.rb
@@ -161,7 +161,9 @@ class OpenAI::Test::UtilFormDataEncodingTest < Minitest::Test
   class FakeCGI < CGI
     def initialize(headers, io)
       @ctype = headers["content-type"]
+      # rubocop:disable Lint/EmptyBlock
       @io = OpenAI::Util::ReadIOAdapter.new(io) {}
+      # rubocop:enable Lint/EmptyBlock
       @c_len = io.to_a.join.bytesize.to_s
       super()
     end
@@ -217,7 +219,9 @@ def test_copy_read
     }
     cases.each do |input, expected|
       io = StringIO.new
+      # rubocop:disable Lint/EmptyBlock
       adapter = OpenAI::Util::ReadIOAdapter.new(input) {}
+      # rubocop:enable Lint/EmptyBlock
       IO.copy_stream(adapter, io)
       assert_equal(expected, io.string)
     end