diff --git a/ui/src/components/IssueProperties.test.tsx b/ui/src/components/IssueProperties.test.tsx
index 497250de9c..6a346577c2 100644
--- a/ui/src/components/IssueProperties.test.tsx
+++ b/ui/src/components/IssueProperties.test.tsx
@@ -1631,7 +1631,7 @@ describe("IssueProperties", () => {
     await flush();
     await flush();
 
-    expect(container.textContent).toContain("Custom · gpt-5.4 · high");
+    expect(container.textContent).toContain("Override · gpt-5.4 · high");
     expect(container.textContent).toContain("Model lane");
 
     // Wait for the adapter-models query to resolve so the model options render.
diff --git a/ui/src/components/issue-properties/IssueProperties.tsx b/ui/src/components/issue-properties/IssueProperties.tsx
index 911228a24b..49e199b2af 100644
--- a/ui/src/components/issue-properties/IssueProperties.tsx
+++ b/ui/src/components/issue-properties/IssueProperties.tsx
@@ -512,9 +512,13 @@ export function IssueProperties({
         assigneeOverrideThinkingEffort,
         assigneeOverrideChrome ? "Chrome" : "",
       ].filter(Boolean);
+      const summary = details.length > 0 ? `Override · ${details.join(" · ")}` : "Override · adapter options";
       return (
-        <span className="min-w-0 truncate text-sm" title={details.length > 0 ? `Custom · ${details.join(" · ")}` : "Custom adapter options"}>
-          Custom{details.length > 0 ? ` · ${details.join(" · ")}` : " adapter options"}
+        <span
+          className="min-w-0 truncate text-sm"
+          title={`Task-level model override — replaces the agent's primary model for this issue.${details.length > 0 ? ` (${details.join(" · ")})` : ""}`}
+        >
+          {summary}
         </span>
       );
     }
@@ -537,7 +541,7 @@ export function IssueProperties({
               )}
               onClick={() => setAssigneeOverrideLane(lane)}
             >
-              {lane === "primary" ? "Primary" : lane === "cheap" ? "Cheap" : "Custom"}
+              {lane === "primary" ? "Primary" : lane === "cheap" ? "Cheap" : "Override"}
             </button>
           ))}
         </div>
@@ -551,6 +555,11 @@ export function IssueProperties({
                 : <>· falls back to the primary model if no cheap profile is configured</>}
           </p>
         ) : null}
+        {assigneeOverrideLane === "custom" ? (
+          <p className="text-xs text-muted-foreground">
+            Task-level model override — replaces the agent&apos;s primary model for this issue.
+          </p>
+        ) : null}
       </div>
       {assigneeOverrideLane === "custom" ? (
         <>
diff --git a/ui/storybook/stories/issue-management.stories.tsx b/ui/storybook/stories/issue-management.stories.tsx
index ed021a4c56..20ba434755 100644
--- a/ui/storybook/stories/issue-management.stories.tsx
+++ b/ui/storybook/stories/issue-management.stories.tsx
@@ -62,6 +62,19 @@ const primaryIssue: Issue = {
   documentSummaries: issueDocumentSummaries,
   currentExecutionWorkspace: storybookExecutionWorkspaces[0]!,
 };
+const modelOverrideIssue: Issue = {
+  ...primaryIssue,
+  id: "issue-model-override-visual",
+  identifier: "MOD-1",
+  issueNumber: 1,
+  title: "Verify task-level model override provenance",
+  assigneeAdapterOverrides: {
+    adapterConfig: {
+      model: "gpt-5.6",
+      modelReasoningEffort: "high",
+    },
+  },
+};
 const childIssues = storybookIssues.filter((issue) => issue.parentId === primaryIssue.id);
 const longProject: Project = {
   ...storybookProjects[0]!,
@@ -311,6 +324,27 @@ function IssuePropertiesLongValuePane({ inline = false }: { inline?: boolean })
   );
 }
 
+function IssuePropertiesModelOverridePane() {
+  return (
+    <StorybookData>
+      <div className="paperclip-story p-6">
+        <div className="mx-auto w-80 border border-border bg-card">
+          <div className="border-b border-border px-4 py-2 text-sm font-medium">Properties</div>
+          <div className="p-4">
+            <IssueProperties
+              issue={modelOverrideIssue}
+              childIssues={[]}
+              onAddSubIssue={() => undefined}
+              onUpdate={() => undefined}
+              inline
+            />
+          </div>
+        </div>
+      </div>
+    </StorybookData>
+  );
+}
+
 function ColumnConfigurationMatrix() {
   const [columns, setColumns] = useState<InboxIssueColumn[]>(visibleColumns);
   const visibleColumnSet = useMemo(() => new Set(columns), [columns]);
@@ -888,6 +922,11 @@ export const IssuePropertiesLongValuesMobile: Story = {
   render: () => <IssuePropertiesLongValuePane inline />,
 };
 
+export const IssuePropertiesModelOverride: Story = {
+  name: "IssueProperties - task model override",
+  render: () => <IssuePropertiesModelOverridePane />,
+};
+
 function ModelProfileLedgerStandalone() {
   return (
     <StorybookData>