diff --git a/internal/client/gemini-cli_client.go b/internal/client/gemini-cli_client.go
index 636c6e9a..6ae50214 100644
--- a/internal/client/gemini-cli_client.go
+++ b/internal/client/gemini-cli_client.go
@@ -38,8 +38,9 @@ const (
 
 var (
 	previewModels = map[string][]string{
-		"gemini-2.5-pro":   {"gemini-2.5-pro-preview-05-06", "gemini-2.5-pro-preview-06-05"},
-		"gemini-2.5-flash": {"gemini-2.5-flash-preview-04-17", "gemini-2.5-flash-preview-05-20"},
+		"gemini-2.5-pro":        {"gemini-2.5-pro-preview-05-06", "gemini-2.5-pro-preview-06-05"},
+		"gemini-2.5-flash":      {"gemini-2.5-flash-preview-04-17", "gemini-2.5-flash-preview-05-20"},
+		"gemini-2.5-flash-lite": {"gemini-2.5-flash-lite-preview-06-17"},
 	}
 )
 
@@ -99,6 +100,7 @@ func (c *GeminiCLIClient) CanProvideModel(modelName string) bool {
 	models := []string{
 		"gemini-2.5-pro",
 		"gemini-2.5-flash",
+		"gemini-2.5-flash-lite",
 	}
 	return util.InArray(models, modelName)
 }
diff --git a/internal/registry/model_definitions.go b/internal/registry/model_definitions.go
index 941be357..83456f30 100644
--- a/internal/registry/model_definitions.go
+++ b/internal/registry/model_definitions.go
@@ -130,6 +130,20 @@ func GetGeminiCLIModels() []*ModelInfo {
 			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:                "Our smallest and most cost effective model, built for at scale usage.",
+			InputTokenLimit:            1048576,
+			OutputTokenLimit:           65536,
+			SupportedGenerationMethods: []string{"generateContent", "countTokens", "createCachedContent", "batchGenerateContent"},
+		},
 	}
 }