diff --git a/ee/lib/api/code_suggestions.rb b/ee/lib/api/code_suggestions.rb
index b1e09d1f1f254b2a483d8be27ca3d51d7501dc46..6d32dc804e873c38b2403f6644a976743967c78a 100644
--- a/ee/lib/api/code_suggestions.rb
+++ b/ee/lib/api/code_suggestions.rb
@@ -30,6 +30,8 @@ def model_gateway_headers(headers, gateway_token)
         {
           'X-Gitlab-Host-Name' => Gitlab.config.gitlab.host,
           'X-Gitlab-Authentication-Type' => 'oidc',
+          # Forward the request time on to the model gateway to calculate latency
+          'X-Gitlab-Rails-Send-Start' => Time.now.to_f.to_s,
           'Authorization' => "Bearer #{gateway_token}",
           'Content-Type' => 'application/json',
           'User-Agent' => headers["User-Agent"] # Forward the User-Agent on to the model gateway
diff --git a/ee/spec/requests/api/code_suggestions_spec.rb b/ee/spec/requests/api/code_suggestions_spec.rb
index 7b71dd8d9eccb7f9535b90b5e10f1325d02146ed..e6e6e747bd5763306ab9dbccf6384d1dcc72dc2c 100644
--- a/ee/spec/requests/api/code_suggestions_spec.rb
+++ b/ee/spec/requests/api/code_suggestions_spec.rb
@@ -506,7 +506,7 @@ def get_user(session):
               post_api
             end
 
-            it 'includes additional headers for SaaS' do
+            it 'includes additional headers for SaaS', :freeze_time do
               group = create(:group)
               group.add_developer(authorized_user)
 
@@ -515,7 +515,8 @@ def get_user(session):
               _, params = workhorse_send_data
               expect(params['Header']).to include(
                 'X-Gitlab-Saas-Namespace-Ids' => [''],
-                'X-Gitlab-Saas-Duo-Pro-Namespace-Ids' => [add_on_purchase.namespace.id.to_s]
+                'X-Gitlab-Saas-Duo-Pro-Namespace-Ids' => [add_on_purchase.namespace.id.to_s],
+                'X-Gitlab-Rails-Send-Start' => [Time.now.to_f.to_s]
               )
             end
 
@@ -721,13 +722,14 @@ def get_user(session):
       context 'when user is authorized' do
         let(:current_user) { authorized_user }
 
-        it 'does not include additional headers, which are for SaaS only' do
+        it 'does not include additional headers, which are for SaaS only', :freeze_time do
           post_api
 
           expect(response.status).to be(200)
           expect(response.body).to eq("".to_json)
           _, params = workhorse_send_data
           expect(params['Header']).not_to have_key('X-Gitlab-Saas-Namespace-Ids')
+          expect(params['Header']).to include('X-Gitlab-Rails-Send-Start' => [Time.now.to_f.to_s])
         end
       end