diff --git a/apps/dashboard/src/App.tsx b/apps/dashboard/src/App.tsx
index 162485c..9e7221b 100644
--- a/apps/dashboard/src/App.tsx
+++ b/apps/dashboard/src/App.tsx
@@ -24,6 +24,7 @@ import {
   type DashboardTaskAction,
   type DashboardOverview,
   type DashboardTask,
+  type FastModeSnapshot,
   type ModelConfigSnapshot,
   type ModelRoleConfig,
   type UpdateScheduledTaskInput,
@@ -33,11 +34,13 @@ import {
   deleteAccount,
   fetchAccounts,
   fetchDashboardData,
+  fetchFastMode,
   fetchModelConfig,
   runInboxAction,
   runServiceAction,
   runScheduledTaskAction,
   sendRoomMessage,
+  updateFastMode,
   updateModels,
   updateScheduledTask,
 } from './api';
@@ -1098,6 +1101,8 @@ function SettingsPanel({
 
       <ModelSettings onRestartStack={onRestartStack} />
 
+      <FastModeSettings />
+
       <AccountSettings onRestartStack={onRestartStack} />
     </div>
   );
@@ -1234,6 +1239,90 @@ function ModelSettings({ onRestartStack }: { onRestartStack: () => void }) {
   );
 }
 
+function FastModeSettings() {
+  const [state, setState] = useState<FastModeSnapshot | null>(null);
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+    fetchFastMode()
+      .then((s) => {
+        if (cancelled) return;
+        setState(s);
+        setError(null);
+      })
+      .catch((err) => {
+        if (cancelled) return;
+        setError(err instanceof Error ? err.message : String(err));
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  async function toggle(provider: keyof FastModeSnapshot) {
+    if (!state) return;
+    const next = !state[provider];
+    const optimistic = { ...state, [provider]: next };
+    setState(optimistic);
+    setBusy(true);
+    setError(null);
+    try {
+      const fresh = await updateFastMode({ [provider]: next });
+      setState(fresh);
+    } catch (err) {
+      setState(state);
+      setError(err instanceof Error ? err.message : String(err));
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  return (
+    <section className="settings-section">
+      <h3>패스트 모드</h3>
+      {error ? <p className="settings-error">{error}</p> : null}
+      {!state ? (
+        <p className="settings-hint">불러오는 중…</p>
+      ) : (
+        <>
+          <label className="settings-toggle-row">
+            <span className="settings-toggle-label">
+              <span className="settings-toggle-title">Codex (GPT)</span>
+              <small className="settings-hint">
+                ~/.codex/config.toml [features].fast_mode — 사용량 더 소모하지만
+                응답이 빨라집니다.
+              </small>
+            </span>
+            <input
+              checked={state.codex}
+              disabled={busy}
+              onChange={() => void toggle('codex')}
+              type="checkbox"
+            />
+          </label>
+          <label className="settings-toggle-row">
+            <span className="settings-toggle-label">
+              <span className="settings-toggle-title">Claude</span>
+              <small className="settings-hint">
+                ~/.claude/settings.json fastMode — 인터랙티브 세션의 /fast 와
+                동일 키. opus-4-6 한정으로 동작.
+              </small>
+            </span>
+            <input
+              checked={state.claude}
+              disabled={busy}
+              onChange={() => void toggle('claude')}
+              type="checkbox"
+            />
+          </label>
+        </>
+      )}
+    </section>
+  );
+}
+
 function formatExpiry(
   iso: string | null,
 ): { label: string; cls: string } | null {
diff --git a/apps/dashboard/src/api.ts b/apps/dashboard/src/api.ts
index a62416d..c804eca 100644
--- a/apps/dashboard/src/api.ts
+++ b/apps/dashboard/src/api.ts
@@ -373,6 +373,11 @@ export interface ModelConfigSnapshot {
   arbiter: ModelRoleConfig;
 }
 
+export interface FastModeSnapshot {
+  codex: boolean;
+  claude: boolean;
+}
+
 export async function fetchAccounts(): Promise<{
   claude: ClaudeAccountSummary[];
   codex: CodexAccountSummary[];
@@ -412,6 +417,34 @@ export async function updateModels(
   return (await response.json()) as ModelConfigSnapshot;
 }
 
+export async function fetchFastMode(): Promise<FastModeSnapshot> {
+  return fetchJson('/api/settings/fast-mode');
+}
+
+export async function updateFastMode(
+  input: Partial<FastModeSnapshot>,
+): Promise<FastModeSnapshot> {
+  const response = await fetch('/api/settings/fast-mode', {
+    method: 'PUT',
+    headers: {
+      accept: 'application/json',
+      'content-type': 'application/json',
+    },
+    body: JSON.stringify(input),
+  });
+  if (!response.ok) {
+    let msg = `update fast mode failed: ${response.status}`;
+    try {
+      const payload = (await response.json()) as { error?: string };
+      if (payload.error) msg = payload.error;
+    } catch {
+      /* ignore */
+    }
+    throw new Error(msg);
+  }
+  return (await response.json()) as FastModeSnapshot;
+}
+
 export async function deleteAccount(
   provider: 'claude' | 'codex',
   index: number,
diff --git a/apps/dashboard/src/styles.css b/apps/dashboard/src/styles.css
index 4824dd1..b0cd849 100644
--- a/apps/dashboard/src/styles.css
+++ b/apps/dashboard/src/styles.css
@@ -814,6 +814,40 @@ button:disabled {
   margin-top: 8px;
 }
 
+.settings-toggle-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 12px;
+  align-items: center;
+  padding: 10px 12px;
+  border: 1px solid var(--panel-border);
+  border-radius: 8px;
+  background: rgba(255, 255, 255, 0.02);
+}
+
+.settings-toggle-row + .settings-toggle-row {
+  margin-top: 6px;
+}
+
+.settings-toggle-label {
+  display: grid;
+  gap: 4px;
+  min-width: 0;
+}
+
+.settings-toggle-title {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--bg-ink);
+}
+
+.settings-toggle-row input[type='checkbox'] {
+  width: 18px;
+  height: 18px;
+  cursor: pointer;
+  accent-color: var(--accent);
+}
+
 .settings-save,
 .settings-restart {
   min-height: 32px;
@@ -874,18 +908,18 @@ button:disabled {
 }
 
 .settings-account-main {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 6px 10px;
+  display: grid;
+  grid-template-columns: 28px minmax(0, 1fr) auto auto;
+  gap: 10px;
   align-items: center;
   min-width: 0;
 }
 
 .settings-account-tag {
-  flex: none;
   font-family: 'JetBrains Mono', ui-monospace, monospace;
   font-size: 11px;
   color: var(--muted);
+  text-align: right;
 }
 
 .settings-account-email {
@@ -895,7 +929,7 @@ button:disabled {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
-  max-width: 100%;
+  min-width: 0;
 }
 
 .settings-account-plan {
diff --git a/src/settings-store.ts b/src/settings-store.ts
index 11954fb..7c0cec5 100644
--- a/src/settings-store.ts
+++ b/src/settings-store.ts
@@ -45,6 +45,11 @@ export interface ModelConfigSnapshot {
   arbiter: ModelRoleConfig;
 }
 
+export interface FastModeSnapshot {
+  codex: boolean;
+  claude: boolean;
+}
+
 const ROLE_KEYS = ['OWNER', 'REVIEWER', 'ARBITER'] as const;
 type RoleKey = (typeof ROLE_KEYS)[number];
 
@@ -272,6 +277,99 @@ export function updateModelConfig(
   return getModelConfig();
 }
 
+function codexConfigPath(): string {
+  return path.join(os.homedir(), '.codex', 'config.toml');
+}
+
+function claudeSettingsPath(): string {
+  return path.join(os.homedir(), '.claude', 'settings.json');
+}
+
+function readCodexFastMode(): boolean {
+  const file = codexConfigPath();
+  if (!fs.existsSync(file)) return false;
+  const content = fs.readFileSync(file, 'utf-8');
+  // [features] section, look for fast_mode = true|false
+  const featuresMatch = content.match(/\[features\][\s\S]*?(?=^\[|\Z)/m);
+  const block = featuresMatch ? featuresMatch[0] : content;
+  const m = block.match(/^\s*fast_mode\s*=\s*(true|false)\s*$/m);
+  return m ? m[1] === 'true' : false;
+}
+
+function writeCodexFastMode(value: boolean): void {
+  const file = codexConfigPath();
+  let content = fs.existsSync(file) ? fs.readFileSync(file, 'utf-8') : '';
+  if (/^\s*fast_mode\s*=\s*(true|false)\s*$/m.test(content)) {
+    content = content.replace(
+      /^\s*fast_mode\s*=\s*(true|false)\s*$/m,
+      `fast_mode = ${value}`,
+    );
+  } else if (/^\[features\]/m.test(content)) {
+    content = content.replace(
+      /^\[features\]\s*$/m,
+      `[features]\nfast_mode = ${value}`,
+    );
+  } else {
+    const trimmed = content.replace(/\s*$/, '');
+    content = `${trimmed}\n\n[features]\nfast_mode = ${value}\n`;
+  }
+  const tempPath = `${file}.tmp`;
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  fs.writeFileSync(tempPath, content, { mode: 0o600 });
+  fs.renameSync(tempPath, file);
+}
+
+function readClaudeFastMode(): boolean {
+  const file = claudeSettingsPath();
+  if (!fs.existsSync(file)) return false;
+  try {
+    const data = JSON.parse(fs.readFileSync(file, 'utf-8')) as Record<
+      string,
+      unknown
+    >;
+    return data.fastMode === true;
+  } catch {
+    return false;
+  }
+}
+
+function writeClaudeFastMode(value: boolean): void {
+  const file = claudeSettingsPath();
+  fs.mkdirSync(path.dirname(file), { recursive: true });
+  let data: Record<string, unknown> = {};
+  if (fs.existsSync(file)) {
+    try {
+      data = JSON.parse(fs.readFileSync(file, 'utf-8')) as Record<
+        string,
+        unknown
+      >;
+    } catch {
+      data = {};
+    }
+  }
+  data.fastMode = value;
+  const tempPath = `${file}.tmp`;
+  fs.writeFileSync(tempPath, `${JSON.stringify(data, null, 2)}\n`, {
+    mode: 0o600,
+  });
+  fs.renameSync(tempPath, file);
+}
+
+export function getFastMode(): FastModeSnapshot {
+  return {
+    codex: readCodexFastMode(),
+    claude: readClaudeFastMode(),
+  };
+}
+
+export function updateFastMode(
+  input: Partial<FastModeSnapshot>,
+): FastModeSnapshot {
+  if (typeof input.codex === 'boolean') writeCodexFastMode(input.codex);
+  if (typeof input.claude === 'boolean') writeClaudeFastMode(input.claude);
+  return getFastMode();
+}
+
 export function removeAccountDirectory(
   provider: 'claude' | 'codex',
   index: number,
diff --git a/src/web-dashboard-server.ts b/src/web-dashboard-server.ts
index 34bf1e6..6d2c990 100644
--- a/src/web-dashboard-server.ts
+++ b/src/web-dashboard-server.ts
@@ -48,10 +48,12 @@ import {
 } from './web-dashboard-data.js';
 import {
   addClaudeAccountFromToken,
+  getFastMode,
   getModelConfig,
   listClaudeAccounts,
   listCodexAccounts,
   removeAccountDirectory,
+  updateFastMode,
   updateModelConfig,
 } from './settings-store.js';
 
@@ -1271,6 +1273,31 @@ export function createWebDashboardHandler(
       }
     }
 
+    if (
+      url.pathname === '/api/settings/fast-mode' &&
+      (request.method === 'PUT' || request.method === 'PATCH')
+    ) {
+      let body: unknown = null;
+      try {
+        body = await request.json();
+      } catch {
+        return jsonResponse({ error: 'Invalid JSON body' }, { status: 400 });
+      }
+      if (!body || typeof body !== 'object') {
+        return jsonResponse(
+          { error: 'Body must be a JSON object' },
+          { status: 400 },
+        );
+      }
+      try {
+        const next = updateFastMode(body as Record<string, unknown>);
+        return jsonResponse(next);
+      } catch (err) {
+        const message = err instanceof Error ? err.message : String(err);
+        return jsonResponse({ error: message }, { status: 500 });
+      }
+    }
+
     {
       const accountAddMatch = url.pathname.match(
         /^\/api\/settings\/accounts\/(claude)$/,
@@ -1518,6 +1545,10 @@ export function createWebDashboardHandler(
       return jsonResponse(getModelConfig());
     }
 
+    if (url.pathname === '/api/settings/fast-mode') {
+      return jsonResponse(getFastMode());
+    }
+
     if (url.pathname === '/api/stream') {
       const encoder = new TextEncoder();
       const stream = new ReadableStream({