diff --git a/api/handler_ai_model.go b/api/handler_ai_model.go
index fcda2098..cba3d01c 100644
--- a/api/handler_ai_model.go
+++ b/api/handler_ai_model.go
@@ -214,7 +214,7 @@ func (s *Server) handleGetSupportedModels(c *gin.Context) {
 		{"id": "qwen", "name": "Qwen", "provider": "qwen", "defaultModel": "qwen3-max"},
 		{"id": "openai", "name": "OpenAI", "provider": "openai", "defaultModel": "gpt-5.1"},
 		{"id": "claude", "name": "Claude", "provider": "claude", "defaultModel": "claude-opus-4-6"},
-		{"id": "gemini", "name": "Google Gemini", "provider": "gemini", "defaultModel": "gemini-3-pro-preview"},
+		{"id": "gemini", "name": "Google Gemini", "provider": "gemini", "defaultModel": "gemini-3.1-pro"},
 		{"id": "grok", "name": "Grok (xAI)", "provider": "grok", "defaultModel": "grok-3-latest"},
 		{"id": "kimi", "name": "Kimi (Moonshot)", "provider": "kimi", "defaultModel": "moonshot-v1-auto"},
 		{"id": "minimax", "name": "MiniMax", "provider": "minimax", "defaultModel": "MiniMax-M2.7"},
diff --git a/mcp/provider/gemini.go b/mcp/provider/gemini.go
index c90ec3ed..3da0306c 100644
--- a/mcp/provider/gemini.go
+++ b/mcp/provider/gemini.go
@@ -8,7 +8,7 @@ import (
 
 const (
 	DefaultGeminiBaseURL = "https://generativelanguage.googleapis.com/v1beta/openai"
-	DefaultGeminiModel   = "gemini-3-pro-preview"
+	DefaultGeminiModel   = "gemini-3.1-pro"
 )
 
 func init() {