Update Gemini model to gemini-3 and adjust thinking budget logic

Author: luispater

cmd/main.go

@@ -100,7 +100,7 @@ func init() {
 			case "openai":
 				cfg.ModelName = "gpt-4o"
 			case "gemini":
-				cfg.ModelName = "gemini-2.5-pro"
+				cfg.ModelName = "gemini-3-flash-preview"
 			}
 		}
 

internal/providers/gemini.go

@@ -198,7 +198,7 @@ func (g *GeminiProvider) TranslateBatch(ctx context.Context, batch []srt.Subtitl
 	if config.Thinking {
 		thinkingBudget = int32(config.ThinkingBudget)
 	} else {
-		if strings.Contains(config.ModelName, "gemini-2.5-pro") {
+		if strings.Contains(config.ModelName, "-pro") {
 			thinkingBudget = 128
 		} else {
 			thinkingBudget = 0

pkg/config/config.go

@@ -66,7 +66,7 @@ func NewConfig() *Config {
 		Provider:       "gemini",                            // Default to Gemini for backward compatibility
 		APIKeys:        parseAPIKeys("GEMINI_API_KEY"),      // Default to Gemini env var
 		BaseURL:        os.Getenv("GOOGLE_GEMINI_BASE_URL"), // Default to Gemini base URL
-		ModelName:      "gemini-2.5-pro",
+		ModelName:      "gemini-3-pro-preview",
 		BatchSize:      300,
 		RetryCount:     3,
 		Streaming:      true,