diff --git a/apps/web/src/components/Sidebar.tsx b/apps/web/src/components/Sidebar.tsx
index 76d678cb35c..23aa8720c35 100644
--- a/apps/web/src/components/Sidebar.tsx
+++ b/apps/web/src/components/Sidebar.tsx
@@ -155,7 +155,11 @@ import {
 import { ProjectFavicon } from "./ProjectFavicon";
 import { ProviderInstanceIcon } from "./chat/ProviderInstanceIcon";
 import { getTriggerDisplayModelLabel } from "./chat/providerIconUtils";
-import { deriveProviderInstanceEntries, type ProviderInstanceEntry } from "../providerInstances";
+import {
+  deriveProviderInstanceEntries,
+  shouldShowInstanceBadge,
+  type ProviderInstanceEntry,
+} from "../providerInstances";
 import { primaryServerProvidersAtom } from "../state/server";
 import { useThreadRunningTerminalIds } from "../state/terminalSessions";
 import { stackedThreadToast, toastManager } from "./ui/toast";
@@ -244,7 +248,8 @@ function SidebarThreadTooltip({
   projectCwd,
   projectFaviconPath,
   environmentLabel,
-  driverKind,
+  providerEntry,
+  showInstanceBadge,
   modelInstanceId,
   modelLabel,
   branchMismatch,
@@ -256,7 +261,8 @@ function SidebarThreadTooltip({
   projectCwd: string | null;
   projectFaviconPath: string | null;
   environmentLabel: string | null;
-  driverKind: ProviderInstanceEntry["driverKind"] | null;
+  providerEntry: ProviderInstanceEntry | null;
+  showInstanceBadge: boolean;
   modelInstanceId: string;
   modelLabel: string;
   branchMismatch: {
@@ -266,6 +272,7 @@ function SidebarThreadTooltip({
   terminalStatus: TerminalStatusIndicator | null;
   terminalProcessCount: number;
 }) {
+  const driverKind = providerEntry?.driverKind ?? null;
   return (
     <TooltipPopup
       side="right"
@@ -314,10 +321,21 @@ function SidebarThreadTooltip({
             <div className="flex min-w-0 items-center gap-2">
               <ProviderInstanceIcon
                 driverKind={driverKind}
-                displayName={thread.session?.providerName ?? modelInstanceId}
+                displayName={
+                  providerEntry?.displayName ?? thread.session?.providerName ?? modelInstanceId
+                }
+                accentColor={providerEntry?.accentColor}
+                // Initials would swallow a size-3 glyph: accent dot, name in label.
+                showBadge={showInstanceBadge && providerEntry?.accentColor !== undefined}
+                badgeContent="none"
+                badgeClassName="h-2 min-w-2 px-0"
                 iconClassName="size-3 shrink-0 grayscale opacity-60"
               />
-              <div className="min-w-0 truncate text-foreground/75">{modelLabel}</div>
+              <div className="min-w-0 truncate text-foreground/75">
+                {showInstanceBadge && providerEntry
+                  ? `${modelLabel} · ${providerEntry.displayName}`
+                  : modelLabel}
+              </div>
             </div>
           ) : null}
           {terminalStatus ? (
@@ -858,6 +876,9 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: {
   const modelInstanceId = thread.session?.providerInstanceId ?? thread.modelSelection.instanceId;
   const providerEntry = props.providerEntryByInstanceId.get(modelInstanceId) ?? null;
   const driverKind = providerEntry?.driverKind ?? null;
+  const showInstanceBadge =
+    providerEntry !== null &&
+    shouldShowInstanceBadge(providerEntry, props.providerEntryByInstanceId.values());
   const selectedModel = providerEntry?.models.find(
     (model) => model.slug === thread.modelSelection.model,
   );
@@ -875,7 +896,8 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: {
       projectCwd={props.projectCwd}
       projectFaviconPath={props.projectFaviconPath}
       environmentLabel={props.environmentLabel}
-      driverKind={driverKind}
+      providerEntry={providerEntry}
+      showInstanceBadge={showInstanceBadge}
       modelInstanceId={modelInstanceId}
       modelLabel={modelLabel}
       branchMismatch={branchMismatch}
@@ -1453,11 +1475,19 @@ const SidebarThreadRow = memo(function SidebarThreadRow(props: {
                   </span>
                 ) : null}
                 {driverKind ? (
-                  <span className="inline-flex shrink-0 items-center opacity-60">
+                  <span className="inline-flex shrink-0 items-center">
                     <ProviderInstanceIcon
                       driverKind={driverKind}
-                      displayName={thread.session?.providerName ?? modelInstanceId}
-                      iconClassName="size-3.5"
+                      displayName={
+                        providerEntry?.displayName ??
+                        thread.session?.providerName ??
+                        modelInstanceId
+                      }
+                      accentColor={providerEntry?.accentColor}
+                      showBadge={showInstanceBadge}
+                      // Glyph dims, badge stays saturated; offset matches the composer trigger.
+                      iconClassName="size-3.5 opacity-60"
+                      badgeClassName="right-[-0.1875rem] bottom-[-0.1875rem] h-3 min-w-3 px-0.5 text-[7px]"
                     />
                   </span>
                 ) : null}
@@ -1514,7 +1544,9 @@ const SidebarSearchResultRow = memo(function SidebarSearchResultRow(props: {
   });
   const modelInstanceId = thread.session?.providerInstanceId ?? thread.modelSelection.instanceId;
   const providerEntry = props.providerEntryByInstanceId.get(modelInstanceId) ?? null;
-  const driverKind = providerEntry?.driverKind ?? null;
+  const showInstanceBadge =
+    providerEntry !== null &&
+    shouldShowInstanceBadge(providerEntry, props.providerEntryByInstanceId.values());
   const selectedModel = providerEntry?.models.find(
     (model) => model.slug === thread.modelSelection.model,
   );
@@ -1572,7 +1604,8 @@ const SidebarSearchResultRow = memo(function SidebarSearchResultRow(props: {
           projectCwd={props.projectCwd}
           projectFaviconPath={props.projectFaviconPath}
           environmentLabel={props.environmentLabel}
-          driverKind={driverKind}
+          providerEntry={providerEntry}
+          showInstanceBadge={showInstanceBadge}
           modelInstanceId={modelInstanceId}
           modelLabel={modelLabel}
           branchMismatch={branchMismatch}
diff --git a/apps/web/src/components/chat/ModelPickerSidebar.tsx b/apps/web/src/components/chat/ModelPickerSidebar.tsx
index 05b44dcb732..df35cbd90e5 100644
--- a/apps/web/src/components/chat/ModelPickerSidebar.tsx
+++ b/apps/web/src/components/chat/ModelPickerSidebar.tsx
@@ -1,10 +1,14 @@
 import { type ProviderInstanceId } from "@t3tools/contracts";
-import { memo, useLayoutEffect, useMemo, useRef, useState } from "react";
+import { memo, useLayoutEffect, useRef, useState } from "react";
 import { SparklesIcon, StarIcon } from "lucide-react";
 import { ProviderInstanceIcon } from "./ProviderInstanceIcon";
 import { Tooltip, TooltipPopup, TooltipTrigger } from "../ui/tooltip";
 import { cn } from "~/lib/utils";
-import { isProviderInstancePickerReady, type ProviderInstanceEntry } from "../../providerInstances";
+import {
+  isProviderInstancePickerReady,
+  shouldShowInstanceBadge,
+  type ProviderInstanceEntry,
+} from "../../providerInstances";
 
 /**
  * Build the hover tooltip for an instance button. Mirrors the old
@@ -65,14 +69,6 @@ export const ModelPickerSidebar = memo(function ModelPickerSidebar(props: {
   const [hoveredInstanceId, setHoveredInstanceId] = useState<ProviderInstanceId | null>(null);
   const sidebarContentRef = useRef<HTMLDivElement>(null);
   const [selectedIndicatorTop, setSelectedIndicatorTop] = useState<number | null>(null);
-  const duplicateDriverCounts = useMemo(() => {
-    const counts = new Map<string, number>();
-    for (const entry of props.instanceEntries) {
-      counts.set(entry.driverKind, (counts.get(entry.driverKind) ?? 0) + 1);
-    }
-    return counts;
-  }, [props.instanceEntries]);
-
   useLayoutEffect(() => {
     const content = sidebarContentRef.current;
     if (!content) {
@@ -143,8 +139,7 @@ export const ModelPickerSidebar = memo(function ModelPickerSidebar(props: {
             const isSelected = props.selectedInstanceId === entry.instanceId;
             const isHovered = hoveredInstanceId === entry.instanceId;
             const showNewBadge = props.newBadgeInstanceIds?.has(entry.instanceId) ?? false;
-            const showInstanceBadge =
-              Boolean(entry.accentColor) || (duplicateDriverCounts.get(entry.driverKind) ?? 0) > 1;
+            const showInstanceBadge = shouldShowInstanceBadge(entry, props.instanceEntries);
 
             const tooltip = isUnavailable
               ? describeUnavailableInstance(entry)
diff --git a/apps/web/src/components/chat/ProviderModelPicker.tsx b/apps/web/src/components/chat/ProviderModelPicker.tsx
index a9b3a398115..bd374a0fd6f 100644
--- a/apps/web/src/components/chat/ProviderModelPicker.tsx
+++ b/apps/web/src/components/chat/ProviderModelPicker.tsx
@@ -16,7 +16,7 @@ import {
   getTriggerDisplayModelLabel,
   getTriggerDisplayModelName,
 } from "./providerIconUtils";
-import type { ProviderInstanceEntry } from "../../providerInstances";
+import { shouldShowInstanceBadge, type ProviderInstanceEntry } from "../../providerInstances";
 import { ComposerControl, ComposerControlChevron } from "./ComposerControl";
 
 export const ProviderModelPicker = memo(function ProviderModelPicker(props: {
@@ -67,10 +67,8 @@ export const ProviderModelPicker = memo(function ProviderModelPicker(props: {
     selectedInstanceOptions[0];
   const triggerTitle = selectedModel ? getTriggerDisplayModelName(selectedModel) : props.model;
   const triggerLabel = selectedModel ? getTriggerDisplayModelLabel(selectedModel) : props.model;
-  const duplicateDriverCount = props.instanceEntries.filter(
-    (entry) => activeEntry !== null && entry.driverKind === activeEntry.driverKind,
-  ).length;
-  const showInstanceBadge = Boolean(activeEntry?.accentColor) || duplicateDriverCount > 1;
+  const showInstanceBadge =
+    activeEntry !== null && shouldShowInstanceBadge(activeEntry, props.instanceEntries);
 
   const setIsMenuOpen = (open: boolean) => {
     props.onOpenChange?.(open);
diff --git a/apps/web/src/providerInstances.ts b/apps/web/src/providerInstances.ts
index 337e68d44d0..fd4ca7da92d 100644
--- a/apps/web/src/providerInstances.ts
+++ b/apps/web/src/providerInstances.ts
@@ -109,6 +109,23 @@ function driverKindLabel(driverKind: ProviderDriverKind): string {
   return PROVIDER_DISPLAY_NAMES[driverKind] ?? formatProviderDriverKindLabel(driverKind);
 }
 
+/**
+ * Whether an instance's icon carries the account badge: accent color set, or
+ * several instances sharing a driver so the brand glyph alone is ambiguous.
+ * Shared by the composer trigger, the picker rail, and sidebar rows.
+ */
+export function shouldShowInstanceBadge(
+  entry: ProviderInstanceEntry,
+  entries: Iterable<ProviderInstanceEntry>,
+): boolean {
+  if (entry.accentColor) return true;
+  let sharedDriverCount = 0;
+  for (const candidate of entries) {
+    if (candidate.driverKind === entry.driverKind && ++sharedDriverCount > 1) return true;
+  }
+  return false;
+}
+
 export function normalizeProviderAccentColor(value: string | undefined): string | undefined {
   const trimmed = value?.trim();
   if (!trimmed) return undefined;