diff --git a/api/core/workflow/nodes/answer/answer_stream_generate_router.py b/api/core/workflow/nodes/answer/answer_stream_generate_router.py
index 1d9c3e9b96..77ff9b603c 100644
--- a/api/core/workflow/nodes/answer/answer_stream_generate_router.py
+++ b/api/core/workflow/nodes/answer/answer_stream_generate_router.py
@@ -151,6 +151,18 @@ class AnswerStreamGeneratorRouter:
                 continue
             source_node_type = node_id_config_mapping[source_node_id].get("data", {}).get("type")
             source_node_data = node_id_config_mapping[source_node_id].get("data", {})
+
+            # Check if this answer node uses sys.total_tokens and add LLM dependencies
+            if source_node_type == NodeType.LLM.value:
+                answer_node_config = node_id_config_mapping.get(answer_node_id)
+                if answer_node_config:
+                    answer_data = answer_node_config.get("data", {})
+                    answer_text = answer_data.get("answer", "")
+                    # Check if the answer template contains sys.total_tokens
+                    if "{{#sys.total_tokens#}}" in answer_text:
+                        answer_dependencies[answer_node_id].append(source_node_id)
+                        continue
+
             if (
                 source_node_type
                 in {
diff --git a/web/app/components/workflow/nodes/start/panel.tsx b/web/app/components/workflow/nodes/start/panel.tsx
index eb04ecb360..eece501946 100644
--- a/web/app/components/workflow/nodes/start/panel.tsx
+++ b/web/app/components/workflow/nodes/start/panel.tsx
@@ -155,8 +155,18 @@ const Panel: FC<NodePanelProps<StartNodeType>> = ({
                   </div>
                 }
               />
+              <VarItem
+                readonly
+                payload={{
+                  variable: 'sys.total_tokens',
+                } as any}
+                rightContent={
+                  <div className='text-xs font-normal text-text-tertiary'>
+                    Number
+                  </div>
+                }
+              />
             </div>
-
           </>
         </Field>
       </div>