diff --git a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
index 300ea8860c3d7..cca8496ce2143 100644
--- a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
+++ b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
@@ -74,6 +74,7 @@ import {
   applyProviderInstanceSettings,
   deriveProviderInstanceEntries,
   shouldShowInstanceBadge,
+  type ProviderInstanceEntry,
 } from "../../providerInstances";
 import { threadEnvironment } from "../../state/threads";
 import { orchestrationEnvironment } from "../../state/orchestration";
@@ -98,6 +99,7 @@ import { Tooltip, TooltipPopup, TooltipTrigger } from "../ui/tooltip";
 import { toastManager } from "../ui/toast";
 import { Spinner } from "../ui/spinner";
 import { ProviderInstanceIcon } from "./ProviderInstanceIcon";
+import { getTriggerDisplayModelName } from "./providerIconUtils";
 import {
   THREAD_DETAILS_PANEL_ACTION_GROUP_CLASS,
   THREAD_DETAILS_PANEL_META_CLASS,
@@ -656,6 +658,13 @@ function useThreadLineage(props: {
   };
 }
 
+function lineageModelLabel(model: string, providerEntry: ProviderInstanceEntry | undefined) {
+  const selectedModel = providerEntry?.models.find((entry) => entry.slug === model);
+  return selectedModel
+    ? getTriggerDisplayModelName(selectedModel, providerEntry?.driverKind)
+    : formatModelSlugName(model);
+}
+
 export function ThreadRelationshipsPanel(props: {
   readonly environmentId: EnvironmentId;
   readonly threadId: ThreadId;
@@ -814,7 +823,7 @@ export function ThreadRelationshipsPanel(props: {
           <span className="truncate text-caption text-muted-foreground">
             {relationship}
             {node?.thread?.modelSelection.model
-              ? ` · ${formatModelSlugName(node.thread.modelSelection.model)}`
+              ? ` · ${lineageModelLabel(node.thread.modelSelection.model, providerEntry)}`
               : ""}
           </span>
         </span>
@@ -1035,7 +1044,13 @@ export function ThreadRelationshipsPanel(props: {
               <span className="flex min-w-0 flex-1 flex-col gap-0.5">
                 <span className="truncate text-meta">{currentThread.title}</span>
                 <span className="truncate text-caption text-muted-foreground">
-                  This thread · {formatModelSlugName(currentThread.modelSelection.model)}
+                  This thread ·{" "}
+                  {lineageModelLabel(
+                    currentThread.modelSelection.model,
+                    providerEntries.find(
+                      (entry) => entry.instanceId === currentThread.modelSelection.instanceId,
+                    ),
+                  )}
                 </span>
               </span>
             </div>