diff --git a/src/components/config/VisualConfigEditor.tsx b/src/components/config/VisualConfigEditor.tsx
index f997c50..b49aacc 100644
--- a/src/components/config/VisualConfigEditor.tsx
+++ b/src/components/config/VisualConfigEditor.tsx
@@ -888,6 +888,13 @@ export function VisualConfigEditor({
                     }
                   />
                 </FieldShell>
+                <Input
+                  label={t('config_management.visual.sections.network.session_affinity_ttl')}
+                  placeholder="1h"
+                  value={values.routingSessionAffinityTTL}
+                  onChange={(e) => onChange({ routingSessionAffinityTTL: e.target.value })}
+                  disabled={disabled}
+                />
               </SectionGrid>
 
               <SectionGrid>
@@ -900,6 +907,12 @@ export function VisualConfigEditor({
                   disabled={disabled}
                   onChange={(forceModelPrefix) => onChange({ forceModelPrefix })}
                 />
+                <ToggleRow
+                  title={t('config_management.visual.sections.network.session_affinity')}
+                  checked={values.routingSessionAffinity}
+                  disabled={disabled}
+                  onChange={(routingSessionAffinity) => onChange({ routingSessionAffinity })}
+                />
                 <ToggleRow
                   title={t('config_management.visual.sections.network.ws_auth')}
                   description={t('config_management.visual.sections.network.ws_auth_desc')}
diff --git a/src/hooks/useVisualConfig.ts b/src/hooks/useVisualConfig.ts
index d26c011..b03f47a 100644
--- a/src/hooks/useVisualConfig.ts
+++ b/src/hooks/useVisualConfig.ts
@@ -656,6 +656,18 @@ function getNextDirtyFields(
   if (Object.prototype.hasOwnProperty.call(patch, 'routingStrategy')) {
     updateDirty('routingStrategy', nextValues.routingStrategy === baselineValues.routingStrategy);
   }
+  if (Object.prototype.hasOwnProperty.call(patch, 'routingSessionAffinity')) {
+    updateDirty(
+      'routingSessionAffinity',
+      nextValues.routingSessionAffinity === baselineValues.routingSessionAffinity
+    );
+  }
+  if (Object.prototype.hasOwnProperty.call(patch, 'routingSessionAffinityTTL')) {
+    updateDirty(
+      'routingSessionAffinityTTL',
+      nextValues.routingSessionAffinityTTL === baselineValues.routingSessionAffinityTTL
+    );
+  }
   if (Object.prototype.hasOwnProperty.call(patch, 'payloadDefaultRules')) {
     updateDirty(
       'payloadDefaultRules',
@@ -836,6 +848,19 @@ export function useVisualConfig() {
         quotaAntigravityCredits: Boolean(quotaExceeded?.['antigravity-credits'] ?? true),
 
         routingStrategy: routing?.strategy === 'fill-first' ? 'fill-first' : 'round-robin',
+        routingSessionAffinity: Boolean(
+          routing?.['session-affinity'] ??
+            routing?.sessionAffinity ??
+            routing?.['sessionAffinity']
+        ),
+        routingSessionAffinityTTL:
+          typeof routing?.['session-affinity-ttl'] === 'string'
+            ? routing['session-affinity-ttl']
+            : typeof routing?.sessionAffinityTTL === 'string'
+              ? routing.sessionAffinityTTL
+              : typeof routing?.['sessionAffinityTTL'] === 'string'
+                ? routing['sessionAffinityTTL']
+                : '',
 
         payloadDefaultRules: parsePayloadRules(payload?.default),
         payloadDefaultRawRules: parseRawPayloadRules(payload?.['default-raw']),
@@ -949,9 +974,20 @@ export function useVisualConfig() {
           deleteIfMapEmpty(doc, ['quota-exceeded']);
         }
 
-        if (docHas(doc, ['routing']) || values.routingStrategy !== 'round-robin') {
+        if (
+          docHas(doc, ['routing']) ||
+          values.routingStrategy !== 'round-robin' ||
+          values.routingSessionAffinity ||
+          values.routingSessionAffinityTTL.trim()
+        ) {
           ensureMapInDoc(doc, ['routing']);
           doc.setIn(['routing', 'strategy'], values.routingStrategy);
+          setBooleanInDoc(doc, ['routing', 'session-affinity'], values.routingSessionAffinity);
+          setStringInDoc(
+            doc,
+            ['routing', 'session-affinity-ttl'],
+            values.routingSessionAffinityTTL
+          );
           deleteIfMapEmpty(doc, ['routing']);
         }
 
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index e529e9a..0984af5 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -1231,8 +1231,10 @@
           "routing_strategy_hint": "Select credential selection strategy",
           "strategy_round_robin": "Round Robin",
           "strategy_fill_first": "Fill First",
+          "session_affinity_ttl": "Session Affinity TTL",
           "force_model_prefix": "Force Model Prefix",
           "force_model_prefix_desc": "Unprefixed model requests only use credentials without prefix",
+          "session_affinity": "Session Affinity Routing",
           "ws_auth": "WebSocket Authentication",
           "ws_auth_desc": "Enable WebSocket authentication (/v1/ws)"
         },
diff --git a/src/i18n/locales/ru.json b/src/i18n/locales/ru.json
index 176353b..ff15c0a 100644
--- a/src/i18n/locales/ru.json
+++ b/src/i18n/locales/ru.json
@@ -1230,8 +1230,10 @@
           "routing_strategy_hint": "Выберите стратегию подбора учётных данных",
           "strategy_round_robin": "По кругу",
           "strategy_fill_first": "Сначала заполнить",
+          "session_affinity_ttl": "TTL привязки сессии",
           "force_model_prefix": "Принудительный префикс модели",
           "force_model_prefix_desc": "Запросы к моделям без префикса используют только учётные данные без префикса",
+          "session_affinity": "Маршрутизация с привязкой к сессии",
           "ws_auth": "Аутентификация WebSocket",
           "ws_auth_desc": "Включить аутентификацию WebSocket (/v1/ws)"
         },
diff --git a/src/i18n/locales/zh-CN.json b/src/i18n/locales/zh-CN.json
index 5d09f7e..490c326 100644
--- a/src/i18n/locales/zh-CN.json
+++ b/src/i18n/locales/zh-CN.json
@@ -1231,8 +1231,10 @@
           "routing_strategy_hint": "选择凭据选择策略",
           "strategy_round_robin": "轮询 (Round Robin)",
           "strategy_fill_first": "填充优先 (Fill First)",
+          "session_affinity_ttl": "会话粘性 TTL",
           "force_model_prefix": "强制模型前缀",
           "force_model_prefix_desc": "未带前缀的模型请求只使用无前缀凭据",
+          "session_affinity": "会话粘性路由",
           "ws_auth": "WebSocket 认证",
           "ws_auth_desc": "启用 WebSocket 连接认证 (/v1/ws)"
         },
diff --git a/src/i18n/locales/zh-TW.json b/src/i18n/locales/zh-TW.json
index 7db6685..3dc52db 100644
--- a/src/i18n/locales/zh-TW.json
+++ b/src/i18n/locales/zh-TW.json
@@ -1259,8 +1259,10 @@
           "routing_strategy_hint": "選擇憑證選擇策略",
           "strategy_round_robin": "輪詢（Round Robin）",
           "strategy_fill_first": "填充優先（Fill First）",
+          "session_affinity_ttl": "會話黏性 TTL",
           "force_model_prefix": "強制模型前綴",
           "force_model_prefix_desc": "未帶前綴的模型請求只使用無前綴憑證",
+          "session_affinity": "會話黏性路由",
           "ws_auth": "WebSocket 驗證",
           "ws_auth_desc": "啟用 WebSocket 連線驗證（/v1/ws）"
         },
diff --git a/src/types/visualConfig.ts b/src/types/visualConfig.ts
index 2f14181..560d985 100644
--- a/src/types/visualConfig.ts
+++ b/src/types/visualConfig.ts
@@ -77,6 +77,8 @@ export type VisualConfigValues = {
   quotaSwitchPreviewModel: boolean;
   quotaAntigravityCredits: boolean;
   routingStrategy: 'round-robin' | 'fill-first';
+  routingSessionAffinity: boolean;
+  routingSessionAffinityTTL: string;
   wsAuth: boolean;
   payloadDefaultRules: PayloadRule[];
   payloadDefaultRawRules: PayloadRule[];
@@ -117,6 +119,8 @@ export const DEFAULT_VISUAL_VALUES: VisualConfigValues = {
   quotaSwitchPreviewModel: true,
   quotaAntigravityCredits: true,
   routingStrategy: 'round-robin',
+  routingSessionAffinity: false,
+  routingSessionAffinityTTL: '',
   wsAuth: false,
   payloadDefaultRules: [],
   payloadDefaultRawRules: [],