diff --git a/src/provider-models.js b/src/provider-models.js
index fbe7352..4c2e666 100644
--- a/src/provider-models.js
+++ b/src/provider-models.js
@@ -17,7 +17,7 @@ export const PROVIDER_MODELS = {
         'gemini-2.5-computer-use-preview-10-2025',
         'gemini-3-pro-image-preview',
         'gemini-3-pro-preview',
-        'gemini-3-flash',
+        'gemini-3-flash-preview',
         'gemini-2.5-flash',
         'gemini-claude-sonnet-4-5',
         'gemini-claude-sonnet-4-5-thinking',
diff --git a/src/provider-pool-manager.js b/src/provider-pool-manager.js
index 73f193e..7705a79 100644
--- a/src/provider-pool-manager.js
+++ b/src/provider-pool-manager.js
@@ -339,6 +339,8 @@ export class ProviderPoolManager {
         if (provider) {
             provider.config.errorCount++;
             provider.config.lastErrorTime = new Date().toISOString();
+            // 更新 lastUsed 时间，避免因 LRU 策略导致失败节点被重复选中
+            provider.config.lastUsed = new Date().toISOString();
             
             // 保存错误信息
             if (errorMessage) {