diff --git a/components/Arena.tsx b/components/Arena.tsx
index a4f355a..c2c8651 100644
--- a/components/Arena.tsx
+++ b/components/Arena.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useEffect, useMemo, useState } from "react";
-import { DEMO_FORCE_OPEN } from "@/lib/mockData";
+import { DEMO_FORCE_OPEN, MODEL_VERSIONS } from "@/lib/mockData";
 import { outcomeLabel, pct, kickoffDisplay, winProb } from "@/lib/format";
 import { type Lang, dict, teamShort } from "@/lib/i18n";
 import type {
@@ -41,6 +41,8 @@ export default function Arena({
   const t = dict(lang);
   const aShort = teamShort(match.teamA, lang);
   const bShort = teamShort(match.teamB, lang);
+  const genDate = (predictions[0]?.generatedAt ?? "").replace(/-/g, ".");
+  const modelVersions = predictions.map((p) => MODEL_VERSIONS[p.model]).join(" · ");
   const [outcome, setOutcome] = useState<Outcome | null>(null);
   const [scoreA, setScoreA] = useState(2);
   const [scoreB, setScoreB] = useState(1);
@@ -142,8 +144,14 @@ export default function Arena({
 
       {/* ===== 레이어드 화이트 시트 (002) ===== */}
       <section className="sheet mt-4 p-5 text-[var(--ink)]">
-        <div className="mb-3">
-          <h2 className="text-[22px] font-extrabold">{t.aiBattle}</h2>
+        <div className="mb-3 flex items-end justify-between gap-2">
+          <h2 className="shrink-0 text-[22px] font-extrabold">{t.aiBattle}</h2>
+          <div className="flex-1 pb-1 text-center text-[11px] leading-snug">
+            <div className="font-bold text-[var(--ink)]">
+              {t.genLabel} · {genDate} 00:00 KST
+            </div>
+            <div className="text-[var(--ink-muted)]">{modelVersions}</div>
+          </div>
         </div>
 
         <div className="flex flex-col gap-3">
diff --git a/lib/i18n.ts b/lib/i18n.ts
index 56171f7..e68db83 100644
--- a/lib/i18n.ts
+++ b/lib/i18n.ts
@@ -91,6 +91,7 @@ type Dict = {
   ado2Tagline: string;
   ado2Sub: string;
   ado2Cta: string;
+  genLabel: string;
 };
 
 export const DICT: Record<Lang, Dict> = {
@@ -146,6 +147,7 @@ export const DICT: Record<Lang, Dict> = {
     footerDisc2: "스포츠 분석·엔터테인먼트 목적의 예측 게임이며 베팅·도박을 권유하지 않습니다. AI 예측은 실제 결과를 보장하지 않습니다.",
     footerDisc3: "100만 원 이벤트는 무료 참여형 챌린지입니다. 지급·동점 처리 조건은 별도 약관에 따릅니다. 이메일은 결과·이벤트 알림 목적으로만 사용됩니다.",
     hook: (a, b) => `${a} vs ${b}, AI의 선택은 갈렸다`,
+    genLabel: "예측 기준",
     adLabel: "광고",
     ado2Tagline: "AI 마케팅 자동화 플랫폼",
     ado2Sub: "AI Marketing Automation Platform →",
@@ -203,6 +205,7 @@ export const DICT: Record<Lang, Dict> = {
     footerDisc2: "A sports-analysis & entertainment prediction game. No betting or gambling. AI predictions do not guarantee real outcomes.",
     footerDisc3: "The ₩1,000,000 event is a free-to-enter challenge. Payout & tie-break terms follow separate rules. Email is used only for result & event alerts.",
     hook: (a, b) => `AI is split on ${a} vs ${b}`,
+    genLabel: "As of",
     adLabel: "AD",
     ado2Tagline: "AI Marketing Automation Platform",
     ado2Sub: "Visit ado2.o2osolution.ai →",
diff --git a/lib/mockData.ts b/lib/mockData.ts
index 61745ef..e5b9a73 100644
--- a/lib/mockData.ts
+++ b/lib/mockData.ts
@@ -74,6 +74,13 @@ function hash(s: string): number {
 
 const MODELS: ModelName[] = ["GPT", "Claude", "Gemini"];
 
+// 예측에 사용한 실제 모델 버전 (UI 투명성 표기용). 갱신 시 .env·AI-PREDICTIONS.md와 함께 변경.
+export const MODEL_VERSIONS: Record<ModelName, string> = {
+  GPT: "gpt-5.5",
+  Claude: "claude-opus-4-8",
+  Gemini: "gemini-3.5-flash",
+};
+
 // AI 셋이 갈리도록 만든 결과 조합 (홈/원정 균형)
 const OUTCOME_SETS: Outcome[][] = [
   ["TEAM_A_WIN", "DRAW", "TEAM_B_WIN"],