diff --git a/api_webchat/controller.js b/api_webchat/controller.js
index 6555c78b..72bf7ac4 100644
--- a/api_webchat/controller.js
+++ b/api_webchat/controller.js
@@ -80,13 +80,13 @@ switch (llm) {
         break;
     }
     case "openai_comp_api": {
-        let prefs_api = await browser.storage.sync.get({openai_comp_host: '', openai_comp_model: '', openai_comp_api_key: '', openai_comp_chat_name: '', do_debug: false});
+        let prefs_api = await browser.storage.sync.get({openai_comp_host: '', openai_comp_model: '', openai_comp_api_key: '', openai_comp_use_v1: true, openai_comp_chat_name: '', do_debug: false});
         let i18nStrings = {};
         i18nStrings["OpenAIComp_api_request_failed"] = browser.i18n.getMessage('OpenAIComp_api_request_failed');
         i18nStrings["error_connection_interrupted"] = browser.i18n.getMessage('error_connection_interrupted');
         messageInput.setModel(prefs_api.openai_comp_model);
         messagesArea.setLLMName(prefs_api.openai_comp_chat_name);
-        worker.postMessage({ type: 'init', openai_comp_host: prefs_api.openai_comp_host, openai_comp_model: prefs_api.openai_comp_model, openai_comp_api_key: prefs_api.openai_comp_api_key, do_debug: prefs_api.do_debug, i18nStrings: i18nStrings});
+        worker.postMessage({ type: 'init', openai_comp_host: prefs_api.openai_comp_host, openai_comp_model: prefs_api.openai_comp_model, openai_comp_api_key: prefs_api.openai_comp_api_key, openai_comp_use_v1: prefs_api.openai_comp_use_v1, do_debug: prefs_api.do_debug, i18nStrings: i18nStrings});
         messagesArea.appendUserMessage(browser.i18n.getMessage("OpenAIComp_api_connecting") + " \"" + prefs_api.openai_comp_host + "\" " +browser.i18n.getMessage("AndModel") + " \"" + prefs_api.openai_comp_model + "\"...", "info");
         browser.runtime.sendMessage({command: "openai_comp_api_ready_" + call_id, window_id: (await browser.windows.getCurrent()).id});
         break;
diff --git a/api_webchat/model-worker-openai_comp.js b/api_webchat/model-worker-openai_comp.js
index 5af68da8..20b1bf10 100644
--- a/api_webchat/model-worker-openai_comp.js
+++ b/api_webchat/model-worker-openai_comp.js
@@ -26,6 +26,7 @@ import { taLogger } from '../js/mzta-logger.js';
 let openai_comp_host = null;
 let openai_comp_model = '';
 let openai_comp_api_key = '';
+let openai_comp_use_v1 = true;
 let openai_comp = null;
 let stopStreaming = false;
 let i18nStrings = null;
@@ -40,7 +41,8 @@ self.onmessage = async function(event) {
         openai_comp_host = event.data.openai_comp_host;
         openai_comp_model = event.data.openai_comp_model;
         openai_comp_api_key = event.data.openai_comp_api_key;
-        openai_comp = new OpenAIComp(openai_comp_host, openai_comp_model, openai_comp_api_key, true);
+        openai_comp_use_v1 = event.data.openai_comp_use_v1;
+        openai_comp = new OpenAIComp(openai_comp_host, openai_comp_model, openai_comp_api_key, true, openai_comp_use_v1);
         do_debug = event.data.do_debug;
         i18nStrings = event.data.i18nStrings;
         taLog = new taLogger('model-worker-openai_comp', do_debug);
diff --git a/js/api/openai_comp.js b/js/api/openai_comp.js
index 0b5fefe2..fe80caaa 100644
--- a/js/api/openai_comp.js
+++ b/js/api/openai_comp.js
@@ -24,13 +24,15 @@ export class OpenAIComp {
   host = '';
   model = '';
   apiKey = '';
+  use_v1 = true;
   stream = false;
 
-  constructor(host, model, apiKey = '', stream = false) {
+  constructor(host, model, apiKey = '', stream = false, use_v1 = true) {
     this.host = host.trim().replace(/\/+$/, "");
     this.model = model;
     this.stream = stream;
     this.apiKey = apiKey;
+    this.use_v1 = use_v1;
   }
 
 
@@ -40,7 +42,7 @@ export class OpenAIComp {
     };
     if(this.apiKey !== '') curr_headers["Authorization"] = "Bearer "+ this.apiKey;
 
-    const response = await fetch(this.host + "/v1/models", {
+    const response = await fetch(this.host + (this.use_v1 ? "/v1" : "") + "/models", {
         method: "GET",
         headers: curr_headers,
     });
@@ -70,7 +72,7 @@ export class OpenAIComp {
     if(this.apiKey !== '') curr_headers["Authorization"] = "Bearer "+ this.apiKey;
 
     try {
-      const response = await fetch(this.host + "/v1/chat/completions", {
+      const response = await fetch(this.host + (this.use_v1 ? "/v1" : "") + "/chat/completions", {
           method: "POST",
           headers: curr_headers,
           body: JSON.stringify({ 
diff --git a/options/mzta-options-default.js b/options/mzta-options-default.js
index 1f055670..014eae76 100644
--- a/options/mzta-options-default.js
+++ b/options/mzta-options-default.js
@@ -29,6 +29,7 @@ export const prefs_default = {
     openai_comp_host: '',   // For OpenAI Compatible API as LM-Studio
     openai_comp_model: '',
     openai_comp_api_key: '',
+    openai_comp_use_v1: true,
     openai_comp_chat_name: 'OpenAI Comp',
     dynamic_menu_force_enter: false,
     dynamic_menu_order_alphabet: true,
diff --git a/options/mzta-options.html b/options/mzta-options.html
index 050d87b5..73d0c328 100644
--- a/options/mzta-options.html
+++ b/options/mzta-options.html
@@ -170,6 +170,17 @@
           </label>
         </td>
       </tr>
+      <tr class="conntype_openai_comp_api">
+        <td><label>
+          <span>__MSG_prefs_OptionText_openai_comp_use_v1__</span>
+        </label></td>
+        <td>
+          <label>
+            <input type="checkbox" id="openai_comp_use_v1" name="openai_comp_use_v1" class="option-input" />
+            &nbsp;<span>__MSG_prefs_OptionText_openai_comp_use_v1_info__</span>
+          </label>
+        </td>
+      </tr>
       <tr class="conntype_openai_comp_api">
         <td><label>
           <span>__MSG_prefs_OpenAIComp_API_Key__</span>
diff --git a/options/mzta-options.js b/options/mzta-options.js
index e4ff6a9d..c4024e2f 100644
--- a/options/mzta-options.js
+++ b/options/mzta-options.js
@@ -342,7 +342,7 @@ select_openai_comp_model.addEventListener("change", warn_OpenAIComp_HostEmpty);
 
   document.getElementById('btnUpdateOpenAICompModels').addEventListener('click', async () => {
     document.getElementById('openai_comp_model_fetch_loading').style.display = 'inline';
-    let openai_comp = new OpenAIComp(document.getElementById("openai_comp_host").value , null, document.getElementById("openai_comp_api_key").value, true);
+    let openai_comp = new OpenAIComp(document.getElementById("openai_comp_host").value , null, document.getElementById("openai_comp_api_key").value, true, document.getElementById("openai_comp_use_v1").checked);
     openai_comp.fetchModels().then((data) => {
       if(!data.ok){
         let errorDetail;