diff --git a/package.json b/package.json
index 87a692f..950cec5 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "test": "node test/ccusage.test.mts"
+    "test": "node test/ccusage.test.mts && for f in test/*.test.mts; do [ \"$f\" = \"test/ccusage.test.mts\" ] || node \"$f\" || exit 1; done"
   },
   "dependencies": {
     "@auth/core": "^0.40.0",
diff --git a/src/app/profile/[username]/page.tsx b/src/app/profile/[username]/page.tsx
index 94a7aa5..ce1f00d 100644
--- a/src/app/profile/[username]/page.tsx
+++ b/src/app/profile/[username]/page.tsx
@@ -21,6 +21,7 @@ import Footer from "@/components/Footer";
 import NavBar from "@/components/NavBar";
 import TierBadge from "@/components/TierBadge";
 import OpenToWorkToggle from "@/components/OpenToWorkToggle";
+import ProfileModelList from "@/components/ProfileModelList";
 
 // ISR the full profile page too — direct loads and sheet "view full profile"
 // both get cached HTML; data is at most 2 minutes stale.
@@ -156,8 +157,6 @@ export default async function ProfilePage({ params }: ProfileParams) {
   );
   const modelTotal = modelEntries.reduce((s, [, v]) => s + v, 0) || 1;
   const topModels = modelEntries.slice(0, MODEL_ROWS);
-  const otherModels = modelEntries.slice(MODEL_ROWS);
-  const otherValue = otherModels.reduce((s, [, v]) => s + v, 0);
 
   // Days each tool was active (cost attribution per tool isn't reliable when
   // a day mixes tools, so day counts are the honest stat).
@@ -365,38 +364,7 @@ export default async function ProfilePage({ params }: ProfileParams) {
                   </h2>
                   <span className="micro-label">{hasModelCosts ? "by cost" : "by days used"}</span>
                 </div>
-                <div className="space-y-3">
-                  {topModels.map(([name, value]) => (
-                    <div key={name}>
-                      <div className="flex justify-between items-center mb-1.5 gap-2">
-                        <span className="text-xs font-mono truncate">{name}</span>
-                        <span className="font-mono text-xs text-muted flex-shrink-0">
-                          {hasModelCosts ? `$${formatCurrency(value)}` : `${value}d`}
-                          <span className="text-muted/60"> · {Math.round((value / modelTotal) * 100)}%</span>
-                        </span>
-                      </div>
-                      <div className="w-full bg-surface-3 rounded-full h-1.5">
-                        <div
-                          className="bg-accent h-1.5 rounded-full"
-                          style={{ width: `${Math.max((value / modelTotal) * 100, 1)}%` }}
-                        />
-                      </div>
-                    </div>
-                  ))}
-                  {otherValue > 0 && (
-                    <div className="flex justify-between items-center pt-1">
-                      <span className="text-xs text-muted">+{otherModels.length} more models</span>
-                      <span className="font-mono text-xs text-muted/60">
-                        {hasModelCosts ? `$${formatCurrency(otherValue)}` : `${otherValue}d`}
-                      </span>
-                    </div>
-                  )}
-                  {!hasModelCosts && (
-                    <p className="text-[11px] text-muted/70 pt-1">
-                      Cost split per model appears after the next <code className="font-mono">npx viberank-cli</code> submission.
-                    </p>
-                  )}
-                </div>
+                <ProfileModelList entries={modelEntries} modelTotal={modelTotal} hasModelCosts={hasModelCosts} />
               </div>
             )}
 
diff --git a/src/components/ProfileModelList.tsx b/src/components/ProfileModelList.tsx
new file mode 100644
index 0000000..8536bdf
--- /dev/null
+++ b/src/components/ProfileModelList.tsx
@@ -0,0 +1,71 @@
+"use client";
+
+import { useState } from "react";
+import { ChevronDown, ChevronUp } from "lucide-react";
+import { formatCurrency } from "@/lib/utils";
+import { splitProfileModelRows, type ProfileModelEntry } from "@/lib/profile-models";
+
+interface ProfileModelListProps {
+  entries: ProfileModelEntry[];
+  modelTotal: number;
+  hasModelCosts: boolean;
+  initialLimit?: number;
+}
+
+export default function ProfileModelList({
+  entries,
+  modelTotal,
+  hasModelCosts,
+  initialLimit = 8,
+}: ProfileModelListProps) {
+  const [expanded, setExpanded] = useState(false);
+  const rows = splitProfileModelRows(entries, { limit: initialLimit, expanded });
+  const total = modelTotal || 1;
+
+  return (
+    <div className="space-y-3">
+      {rows.visible.map(([name, value]) => (
+        <div key={name}>
+          <div className="flex justify-between items-center mb-1.5 gap-2">
+            <span className="text-xs font-mono truncate">{name}</span>
+            <span className="font-mono text-xs text-muted flex-shrink-0">
+              {hasModelCosts ? `$${formatCurrency(value)}` : `${value}d`}
+              <span className="text-muted/60"> · {Math.round((value / total) * 100)}%</span>
+            </span>
+          </div>
+          <div className="w-full bg-surface-3 rounded-full h-1.5">
+            <div
+              className="bg-accent h-1.5 rounded-full"
+              style={{ width: `${Math.max((value / total) * 100, 1)}%` }}
+            />
+          </div>
+        </div>
+      ))}
+
+      {rows.canExpand && (
+        <div className="flex items-center justify-between gap-3 pt-1">
+          <button
+            type="button"
+            onClick={() => setExpanded((value) => !value)}
+            aria-expanded={expanded}
+            className="inline-flex items-center gap-1.5 rounded-md border border-border bg-surface-2 px-2 py-1 text-xs font-mono text-muted transition-colors hover:text-foreground focus:outline-none focus:ring-1 focus:ring-accent"
+          >
+            {expanded ? <ChevronUp className="w-3.5 h-3.5" /> : <ChevronDown className="w-3.5 h-3.5" />}
+            {expanded ? "Show fewer" : `Show ${rows.hidden.length} more`}
+          </button>
+          {!expanded && rows.hiddenTotal > 0 && (
+            <span className="font-mono text-xs text-muted/60">
+              {hasModelCosts ? `$${formatCurrency(rows.hiddenTotal)}` : `${rows.hiddenTotal}d`}
+            </span>
+          )}
+        </div>
+      )}
+
+      {!hasModelCosts && (
+        <p className="text-[11px] text-muted/70 pt-1">
+          Cost split per model appears after the next <code className="font-mono">npx viberank-cli</code> submission.
+        </p>
+      )}
+    </div>
+  );
+}
diff --git a/src/lib/profile-models.ts b/src/lib/profile-models.ts
new file mode 100644
index 0000000..43e7dc4
--- /dev/null
+++ b/src/lib/profile-models.ts
@@ -0,0 +1,25 @@
+export type ProfileModelEntry = readonly [string, number];
+
+export interface ProfileModelRows {
+  visible: ProfileModelEntry[];
+  hidden: ProfileModelEntry[];
+  hiddenTotal: number;
+  canExpand: boolean;
+}
+
+export function splitProfileModelRows(
+  entries: ProfileModelEntry[],
+  options: { limit: number; expanded: boolean }
+): ProfileModelRows {
+  const limit = Math.max(0, Math.floor(options.limit));
+  const canExpand = entries.length > limit;
+  const visible = options.expanded || !canExpand ? entries : entries.slice(0, limit);
+  const hidden = options.expanded || !canExpand ? [] : entries.slice(limit);
+
+  return {
+    visible,
+    hidden,
+    hiddenTotal: hidden.reduce((sum, [, value]) => sum + value, 0),
+    canExpand,
+  };
+}
diff --git a/test/profile-models.test.mts b/test/profile-models.test.mts
new file mode 100644
index 0000000..f23ba62
--- /dev/null
+++ b/test/profile-models.test.mts
@@ -0,0 +1,48 @@
+/**
+ * Focused tests for profile model-list presentation.
+ * Run: node test/profile-models.test.mts
+ */
+
+const { splitProfileModelRows } = await import("../src/lib/profile-models.ts");
+
+let passed = 0;
+let failed = 0;
+
+function ok(name: string, cond: boolean, detail = "") {
+  if (cond) {
+    passed++;
+    console.log(`  ✓ ${name}`);
+  } else {
+    failed++;
+    console.log(`  ✗ ${name} ${detail}`);
+  }
+}
+
+console.log("\n[1] Profile model list can expand beyond the default rows");
+{
+  const entries = Array.from({ length: 11 }, (_, index) => [`model-${index + 1}`, 11 - index] as [string, number]);
+
+  const collapsed = splitProfileModelRows(entries, { limit: 8, expanded: false });
+  ok("shows only the default row count when collapsed", collapsed.visible.length === 8, `got ${collapsed.visible.length}`);
+  ok("keeps hidden rows accessible", collapsed.hidden.length === 3, `got ${collapsed.hidden.length}`);
+  ok("marks list as expandable", collapsed.canExpand);
+  ok("sums hidden row values", collapsed.hiddenTotal === 6, `got ${collapsed.hiddenTotal}`);
+
+  const expanded = splitProfileModelRows(entries, { limit: 8, expanded: true });
+  ok("shows every row when expanded", expanded.visible.length === 11, `got ${expanded.visible.length}`);
+  ok("hides no rows after expansion", expanded.hidden.length === 0, `got ${expanded.hidden.length}`);
+  ok("still marks list as collapsible", expanded.canExpand);
+}
+
+console.log("\n[2] Short model lists do not render expansion controls");
+{
+  const entries: [string, number][] = [["opus", 3], ["sonnet", 2]];
+  const rows = splitProfileModelRows(entries, { limit: 8, expanded: false });
+
+  ok("shows all short-list rows", rows.visible.length === 2, `got ${rows.visible.length}`);
+  ok("has no hidden rows", rows.hidden.length === 0, `got ${rows.hidden.length}`);
+  ok("does not mark short list as expandable", !rows.canExpand);
+}
+
+console.log(`\n${failed === 0 ? "✅" : "❌"} ${passed} passed, ${failed} failed\n`);
+process.exit(failed === 0 ? 0 : 1);