diff --git a/tui_gateway/server.py b/tui_gateway/server.py
index 71c343907d..0582b745dc 100644
--- a/tui_gateway/server.py
+++ b/tui_gateway/server.py
@@ -4868,6 +4868,49 @@ def _(rid, params: dict) -> dict:
         return _err(rid, 5034, str(e))
 
 
+@method("model.disconnect")
+def _(rid, params: dict) -> dict:
+    """Remove credentials for a provider.
+
+    Params:
+        slug: provider slug (e.g. "deepseek", "xai")
+
+    Returns success status and the provider's slug.
+    """
+    try:
+        from hermes_cli.auth import PROVIDER_REGISTRY, clear_provider_auth
+        from hermes_cli.config import remove_env_value
+
+        slug = (params.get("slug") or "").strip()
+        if not slug:
+            return _err(rid, 4001, "slug is required")
+
+        pconfig = PROVIDER_REGISTRY.get(slug)
+        cleared_env = False
+        cleared_auth = False
+
+        # Remove API key env vars from .env and process
+        if pconfig and pconfig.api_key_env_vars:
+            for ev in pconfig.api_key_env_vars:
+                if remove_env_value(ev):
+                    cleared_env = True
+
+        # Clear OAuth / credential pool state
+        cleared_auth = clear_provider_auth(slug)
+
+        if not cleared_env and not cleared_auth:
+            return _err(rid, 4005, f"no credentials found for {slug}")
+
+        provider_name = pconfig.name if pconfig else slug
+        return _ok(rid, {
+            "slug": slug,
+            "name": provider_name,
+            "disconnected": True,
+        })
+    except Exception as e:
+        return _err(rid, 5035, str(e))
+
+
 # ── Methods: slash.exec ──────────────────────────────────────────────
 
 
diff --git a/ui-tui/src/components/modelPicker.tsx b/ui-tui/src/components/modelPicker.tsx
index 1e1386132f..ea999e55e2 100644
--- a/ui-tui/src/components/modelPicker.tsx
+++ b/ui-tui/src/components/modelPicker.tsx
@@ -14,7 +14,7 @@ const VISIBLE = 12
 const MIN_WIDTH = 40
 const MAX_WIDTH = 90
 
-type Stage = 'provider' | 'key' | 'model'
+type Stage = 'provider' | 'key' | 'model' | 'disconnect'
 
 export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPickerProps) {
   const [providers, setProviders] = useState<ModelOptionProvider[]>([])
@@ -73,7 +73,7 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
   const names = useMemo(() => providerDisplayNames(providers), [providers])
 
   const back = () => {
-    if (stage === 'model' || stage === 'key') {
+    if (stage === 'model' || stage === 'key' || stage === 'disconnect') {
       setStage('provider')
       setModelIdx(0)
       setKeyInput('')
@@ -153,6 +153,53 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
       return
     }
 
+    // Disconnect confirmation stage
+    if (stage === 'disconnect') {
+      if (ch.toLowerCase() === 'y' || key.return) {
+        if (!provider) {
+          setStage('provider')
+
+          return
+        }
+
+        setKeySaving(true)
+        gw.request<{ disconnected?: boolean }>('model.disconnect', {
+          slug: provider.slug,
+          ...(sessionId ? { session_id: sessionId } : {}),
+        })
+          .then(raw => {
+            const r = asRpcResult<{ disconnected?: boolean }>(raw)
+
+            if (r?.disconnected) {
+              // Mark provider as unauthenticated in local state
+              setProviders(prev =>
+                prev.map(p => p.slug === provider.slug
+                  ? { ...p, authenticated: false, models: [], total_models: 0, warning: p.key_env ? `paste ${p.key_env} to activate` : 'run `hermes model` to configure' }
+                  : p
+                )
+              )
+            }
+
+            setKeySaving(false)
+            setStage('provider')
+          })
+          .catch(() => {
+            setKeySaving(false)
+            setStage('provider')
+          })
+
+        return
+      }
+
+      if (ch.toLowerCase() === 'n' || key.escape) {
+        setStage('provider')
+
+        return
+      }
+
+      return
+    }
+
     const count = stage === 'provider' ? providers.length : models.length
     const sel = stage === 'provider' ? providerIdx : modelIdx
     const setSel = stage === 'provider' ? setProviderIdx : setModelIdx
@@ -210,6 +257,13 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
       return
     }
 
+    // Disconnect: only in provider stage, only for authenticated providers
+    if (ch.toLowerCase() === 'd' && stage === 'provider' && provider?.authenticated !== false) {
+      setStage('disconnect')
+
+      return
+    }
+
     const n = ch === '0' ? 10 : parseInt(ch, 10)
 
     if (!Number.isNaN(n) && n >= 1 && n <= Math.min(10, count)) {
@@ -294,6 +348,35 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
     )
   }
 
+  // ── Disconnect confirmation stage ─────────────────────────────────────
+  if (stage === 'disconnect' && provider) {
+    return (
+      <Box flexDirection="column" width={width}>
+        <Text bold color={t.color.accent} wrap="truncate-end">
+          Disconnect {provider.name}?
+        </Text>
+
+        <Text color={t.color.muted} wrap="truncate-end"> </Text>
+
+        <Text color={t.color.muted} wrap="truncate-end">
+          This removes saved credentials for {provider.name}.
+        </Text>
+
+        <Text color={t.color.muted} wrap="truncate-end">
+          You can re-authenticate later by selecting it again.
+        </Text>
+
+        <Text color={t.color.muted} wrap="truncate-end"> </Text>
+
+        {keySaving ? (
+          <Text color={t.color.muted} wrap="truncate-end">disconnecting…</Text>
+        ) : (
+          <OverlayHint t={t}>y/Enter confirm · n/Esc cancel</OverlayHint>
+        )}
+      </Box>
+    )
+  }
+
   // ── Provider selection stage ─────────────────────────────────────────
   if (stage === 'provider') {
     const rows = providers.map(
@@ -359,7 +442,7 @@ export function ModelPicker({ gw, onCancel, onSelect, sessionId, t }: ModelPicke
         <Text color={t.color.muted} wrap="truncate-end">
           persist: {persistGlobal ? 'global' : 'session'} · g toggle
         </Text>
-        <OverlayHint t={t}>↑/↓ select · Enter choose · Esc/q cancel</OverlayHint>
+        <OverlayHint t={t}>↑/↓ select · Enter choose · d disconnect · Esc/q cancel</OverlayHint>
       </Box>
     )
   }