diff --git a/src/providers/gemini/antigravity-core.js b/src/providers/gemini/antigravity-core.js
index 73e7714..c316a6a 100644
--- a/src/providers/gemini/antigravity-core.js
+++ b/src/providers/gemini/antigravity-core.js
@@ -1312,8 +1312,8 @@ export class AntigravityApiService {
 
         let selectedModel = model;
         if (!this.availableModels.includes(model)) {
-            logger.warn(`[Antigravity] Model '${model}' not found. Using default model: '${this.availableModels[0]}'`);
-            selectedModel = this.availableModels[0];
+            logger.warn(`[Antigravity] Model '${model}' not found. Using default model: 'gemini-3-flash'`);
+            selectedModel = 'gemini-3-flash';
         }
 
         // 移除 gemini- 前缀以获取实际模型名称（针对 claude 模型）
@@ -1390,8 +1390,8 @@ export class AntigravityApiService {
 
         let selectedModel = model;
         if (!this.availableModels.includes(model)) {
-            logger.warn(`[Antigravity] Model '${model}' not found. Using default model: '${this.availableModels[0]}'`);
-            selectedModel = this.availableModels[0];
+            logger.warn(`[Antigravity] Model '${model}' not found. Using default model: 'gemini-3-flash'`);
+            selectedModel = 'gemini-3-flash';
         }
 
         // 移除 gemini- 前缀以获取实际模型名称（针对 claude 模型）
diff --git a/src/providers/provider-models.js b/src/providers/provider-models.js
index 53b871e..4998f71 100644
--- a/src/providers/provider-models.js
+++ b/src/providers/provider-models.js
@@ -21,6 +21,9 @@ export const PROVIDER_MODELS = {
         'gemini-3.1-pro-low',
         'gemini-3.1-flash-image',
         'gemini-3-flash-agent',
+        'gemini-2.5-flash',
+        'gemini-2.5-flash-lite',
+        'gemini-2.5-flash-thinking',
         'gemini-claude-sonnet-4-6',
         'gemini-claude-opus-4-6-thinking',
     ],