diff --git a/internal/api/server.go b/internal/api/server.go
index cf5328de..0c636cc7 100644
--- a/internal/api/server.go
+++ b/internal/api/server.go
@@ -233,6 +233,11 @@ func (s *Server) UpdateClients(clients []interfaces.Client, cfg *config.Config)
 //   - gin.HandlerFunc: The authentication middleware handler
 func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
 	return func(c *gin.Context) {
+		if cfg.AllowLocalhostUnauthenticated && strings.HasPrefix(c.Request.RemoteAddr, "127.0.0.1:") {
+			c.Next()
+			return
+		}
+
 		if len(cfg.APIKeys) == 0 {
 			c.Next()
 			return
diff --git a/internal/client/gemini-cli_client.go b/internal/client/gemini-cli_client.go
index d1c6bdf9..1fa01f65 100644
--- a/internal/client/gemini-cli_client.go
+++ b/internal/client/gemini-cli_client.go
@@ -73,7 +73,7 @@ func NewGeminiCLIClient(httpClient *http.Client, ts *geminiAuth.GeminiTokenStora
 
 	// Initialize model registry and register Gemini models
 	client.InitializeModelRegistry(clientID)
-	client.RegisterModels("gemini-cli", registry.GetGeminiModels())
+	client.RegisterModels("gemini-cli", registry.GetGeminiCLIModels())
 
 	return client
 }
diff --git a/internal/config/config.go b/internal/config/config.go
index 3fd40f42..a4b09990 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -40,10 +40,14 @@ type Config struct {
 	// RequestRetry defines the retry times when the request failed.
 	RequestRetry int `yaml:"request-retry"`
 
+	// ClaudeKey defines a list of Claude API key configurations as specified in the YAML configuration file.
 	ClaudeKey []ClaudeKey `yaml:"claude-api-key"`
 
 	// OpenAICompatibility defines OpenAI API compatibility configurations for external providers.
 	OpenAICompatibility []OpenAICompatibility `yaml:"openai-compatibility"`
+
+	// AllowLocalhostUnauthenticated allows unauthenticated requests from localhost.
+	AllowLocalhostUnauthenticated bool `yaml:"allow-localhost-unauthenticated"`
 }
 
 // QuotaExceeded defines the behavior when API quota limits are exceeded.
diff --git a/internal/registry/model_definitions.go b/internal/registry/model_definitions.go
index 2ee4cd2d..2a4c2880 100644
--- a/internal/registry/model_definitions.go
+++ b/internal/registry/model_definitions.go
@@ -53,6 +53,54 @@ func GetClaudeModels() []*ModelInfo {
 
 // GetGeminiModels returns the standard Gemini model definitions
 func GetGeminiModels() []*ModelInfo {
+	return []*ModelInfo{
+		{
+			ID:                         "gemini-2.5-flash",
+			Object:                     "model",
+			Created:                    time.Now().Unix(),
+			OwnedBy:                    "google",
+			Type:                       "gemini",
+			Name:                       "models/gemini-2.5-flash",
+			Version:                    "001",
+			DisplayName:                "Gemini 2.5 Flash",
+			Description:                "Stable version of Gemini 2.5 Flash, our mid-size multimodal model that supports up to 1 million tokens, released in June of 2025.",
+			InputTokenLimit:            1048576,
+			OutputTokenLimit:           65536,
+			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+		},
+		{
+			ID:                         "gemini-2.5-pro",
+			Object:                     "model",
+			Created:                    time.Now().Unix(),
+			OwnedBy:                    "google",
+			Type:                       "gemini",
+			Name:                       "models/gemini-2.5-pro",
+			Version:                    "2.5",
+			DisplayName:                "Gemini 2.5 Pro",
+			Description:                "Stable release (June 17th, 2025) of Gemini 2.5 Pro",
+			InputTokenLimit:            1048576,
+			OutputTokenLimit:           65536,
+			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+		},
+		{
+			ID:                         "gemini-2.5-flash-lite",
+			Object:                     "model",
+			Created:                    time.Now().Unix(),
+			OwnedBy:                    "google",
+			Type:                       "gemini",
+			Name:                       "models/gemini-2.5-flash-lite",
+			Version:                    "2.5",
+			DisplayName:                "Gemini 2.5 Flash Lite",
+			Description:                "Stable release (June 17th, 2025) of Gemini 2.5 Flash Lite",
+			InputTokenLimit:            1048576,
+			OutputTokenLimit:           65536,
+			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+		},
+	}
+}
+
+// GetGeminiCLIModels returns the standard Gemini model definitions
+func GetGeminiCLIModels() []*ModelInfo {
 	return []*ModelInfo{
 		{
 			ID:                         "gemini-2.5-flash",