diff --git a/ee/config/feature_flags/gitlab_com_derisk/duo_code_review_claude_4_0_rollout.yml b/ee/config/feature_flags/gitlab_com_derisk/duo_code_review_claude_4_0_rollout.yml
new file mode 100644
index 0000000000000000000000000000000000000000..6a416d2e974fb19ae2073d4d7a33b13414e440a0
--- /dev/null
+++ b/ee/config/feature_flags/gitlab_com_derisk/duo_code_review_claude_4_0_rollout.yml
@@ -0,0 +1,10 @@
+---
+name: duo_code_review_claude_4_0_rollout
+description: enable
+feature_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/545502
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/192920
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/546438
+milestone: '18.1'
+group: group::code review
+type: gitlab_com_derisk
+default_enabled: false
diff --git a/ee/lib/gitlab/llm/ai_gateway/completions/review_merge_request.rb b/ee/lib/gitlab/llm/ai_gateway/completions/review_merge_request.rb
index 996dd0dfaebdd3e3dab7001ca61d22c1d30b6d54..b9ae5449b42ca04dd5e66d33f45c9f7adc30e41b 100644
--- a/ee/lib/gitlab/llm/ai_gateway/completions/review_merge_request.rb
+++ b/ee/lib/gitlab/llm/ai_gateway/completions/review_merge_request.rb
@@ -81,7 +81,13 @@ def inputs
 
           override :prompt_version
           def prompt_version
-            '1.0.0' # Claude 3.7 Sonnet
+            version = '1.0.0' # Claude 3.7 Sonnet
+
+            if Feature.enabled?(:duo_code_review_claude_4_0_rollout, user)
+              version = '1.1.0' # Claude 4.0 Sonnet
+            end
+
+            version
           end
 
           def user
diff --git a/ee/spec/lib/gitlab/llm/ai_gateway/completions/review_merge_request_spec.rb b/ee/spec/lib/gitlab/llm/ai_gateway/completions/review_merge_request_spec.rb
index 425e20baa0f3fa3b181d360d519eb5f1833a6838..b529c161de40f535ba9f8cda8a450bc45677b2e8 100644
--- a/ee/spec/lib/gitlab/llm/ai_gateway/completions/review_merge_request_spec.rb
+++ b/ee/spec/lib/gitlab/llm/ai_gateway/completions/review_merge_request_spec.rb
@@ -82,6 +82,8 @@
     end
 
     before do
+      stub_feature_flags(duo_code_review_claude_4_0_rollout: false)
+
       allow_next_instance_of(
         review_prompt_class,
         mr_title: merge_request.title,
@@ -312,6 +314,21 @@
         expect(merge_request.notes.non_diff_notes.last.note).to eq(summary_answer)
       end
 
+      context 'when using claude_4_0 for duo code review' do
+        let(:prompt_version) { '1.1.0' }
+
+        before do
+          stub_feature_flags(duo_code_review_claude_4_0_rollout: true)
+        end
+
+        # rubocop:disable RSpec/NoExpectationExample -- allow_next_instance_of Gitlab::Llm::AiGateway::Client
+        # in before clause will do the check
+        it 'successfully creates a note' do
+          completion.execute
+        end
+        # rubocop:enable RSpec/NoExpectationExample
+      end
+
       context 'when draft_notes is empty after mapping DraftNote objects' do
         let(:summary_response) { nil }
         let(:combined_review_response) do