diff --git a/auth.h b/auth.h
index cf32dd9..141f0ea 100644
--- a/auth.h
+++ b/auth.h
@@ -12,6 +12,13 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+enum AUTH_TYPE {
+    AUTH_TYPE_API_KEY,
+    AUTH_TYPE_FREE
+};
+
+int auth_type = AUTH_TYPE_FREE;
+
 const char *resolve_api_key() {
     static char *api_key = NULL;
     api_key = getenv("R_KEY");
@@ -20,6 +27,7 @@ const char *resolve_api_key() {
     }
     api_key = getenv("OPENAI_API_KEY");
     if (api_key) {
+        auth_type = AUTH_TYPE_API_KEY;
         return api_key;
     }
     api_key = "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";
diff --git a/chat.h b/chat.h
index c1df187..54e2437 100644
--- a/chat.h
+++ b/chat.h
@@ -31,14 +31,18 @@
 #define R_PROMPT_H
 
 #include "tools.h"
+#include "auth.h"
 #include <json-c/json.h>
 #include "messages.h"
 
-#ifdef FREE_VERSION
-static char *prompt_model = "gpt-3.5-turbo";
-#else
-static char *prompt_model = "gpt-4o-mini";
-#endif
+const char * get_prompt_model() { 
+    if(auth_type != AUTH_TYPE_API_KEY) {
+        return "gpt-3.5-turbo";
+    } else {
+        return "gpt-4o-mini";
+    }
+}
+
 static int prompt_max_tokens = 2048;
 static double prompt_temperature = 0.1;
 
@@ -53,7 +57,7 @@ void chat_free() {
 char *chat_json(const char *role, const char *message) {
     chat_free();
     json_object *root_object = json_object_new_object();
-    json_object_object_add(root_object, "model", json_object_new_string(prompt_model));
+    json_object_object_add(root_object, "model", json_object_new_string(get_prompt_model()));
     
     if (role != NULL && message != NULL) {
         message_add(role, message);
@@ -67,4 +71,4 @@ char *chat_json(const char *role, const char *message) {
     return (char *)json_object_to_json_string_ext(root_object, JSON_C_TO_STRING_PRETTY);
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/main.c b/main.c
index 6984990..918805d 100644
--- a/main.c
+++ b/main.c
@@ -247,7 +247,7 @@ void help() {
                      " - **google search** and actions with those results.\n"
                      " - **reminders**.\n"
                      " - predefined **templates** for **reviewing** / **refactoring** so you can personalize.\n";
-    sprintf(help_text, template, prompt_temperature, prompt_model, prompt_max_tokens);
+    sprintf(help_text, template, prompt_temperature, get_prompt_model(), prompt_max_tokens);
     render(help_text);
 }