diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index d59ac3a1..405791b3 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -938,5 +938,13 @@
   "GoogleGemini_SystemInstruction_Info": {
     "message": "When you set a system instruction, you give the model additional context to understand the task, provide more customized responses, and adhere to specific guidelines over the prompt that will be sent.",
     "description": ""
+  },
+  "ChatGPT_Developer_Messages": {
+    "message": "Developer Messages",
+    "description": ""
+  },
+  "ChatGPT_Developer_Messages_Info": {
+    "message": "When you set the developer messages, you give the model additional context to understand the task, provide more customized responses, and adhere to specific guidelines over the prompt that will be sent.",
+    "description": ""
   }
 }
\ No newline at end of file
diff --git a/options/mzta-options-default.js b/options/mzta-options-default.js
index 003f42c6..7a2315bb 100644
--- a/options/mzta-options-default.js
+++ b/options/mzta-options-default.js
@@ -26,6 +26,7 @@ export const prefs_default = {
     chatgpt_web_tempchat: false,
     chatgpt_api_key: '',
     chatgpt_model: '',
+    chatgpt_developer_messages: '',
     ollama_host: '',
     ollama_model: '',
     openai_comp_host: '',   // For OpenAI Compatible API as LM-Studio
diff --git a/options/mzta-options.css b/options/mzta-options.css
index 63617562..e3680a08 100644
--- a/options/mzta-options.css
+++ b/options/mzta-options.css
@@ -118,7 +118,7 @@ tr.conntype_google_gemini_api, tr.conntype_google_gemini_api2{
     font-style: italic;
 }
 
-#google_gemini_system_instruction{
+textarea.option-textarea{
     width: -moz-available;
     height: 10em;
 }
diff --git a/options/mzta-options.html b/options/mzta-options.html
index 3c505881..76e99676 100644
--- a/options/mzta-options.html
+++ b/options/mzta-options.html
@@ -175,6 +175,19 @@
           </label>
         </td>
       </tr>
+      <tr class="conntype_chatgpt_api">
+        <td>
+          <label>
+            <span>__MSG_ChatGPT_Developer_Messages__</span>
+          </label>
+        </td>
+        <td>
+          <label>
+            <textarea id="chatgpt_developer_messages" name="chatgpt_developer_messages" class="option-input option-textarea"></textarea>
+            <br>__MSG_ChatGPT_Developer_Messages_Info__
+          </label>
+        </td>
+      </tr>
       <tr class="conntype_google_gemini_api">
         <td><label>
           <span>__MSG_prefs_GoogleGemini_API_Key__</span>
@@ -210,7 +223,7 @@
         </td>
         <td>
           <label>
-            <textarea id="google_gemini_system_instruction" name="google_gemini_system_instruction" class="option-input"></textarea>
+            <textarea id="google_gemini_system_instruction" name="google_gemini_system_instruction" class="option-input option-textarea"></textarea>
             <br>__MSG_GoogleGemini_SystemInstruction_Info__
           </label>
         </td>