diff --git a/node-zerox/src/types.ts b/node-zerox/src/types.ts
index 9fde4314..2724551d 100644
--- a/node-zerox/src/types.ts
+++ b/node-zerox/src/types.ts
@@ -11,10 +11,7 @@ export interface ZeroxArgs {
   tempDir?: string;
 }
 
-export enum ModelOptions {
-  gpt_4o = "gpt-4o",
-  gpt_4o_mini = "gpt-4o-mini",
-}
+export type ModelOptions = "gpt-4o" | "gpt-4o-mini";
 
 export interface Page {
   content: string;