diff --git a/src/parts/modals.html b/src/parts/modals.html
index d6e33f8..a55254d 100644
--- a/src/parts/modals.html
+++ b/src/parts/modals.html
@@ -70,6 +70,7 @@
         </div>
         <div id="panelPrompt" class="p-4 space-y-4 hidden">
           <div><div class="flex items-center justify-between mb-1"><label for="set_system_prompt" class="block text-gray-700 font-medium">System Prompt</label><div class="flex gap-2"><button type="button" id="copySystemPrompt" class="px-2 py-1 text-xs rounded-md bg-gray-100 hover:bg-gray-200">Copy</button><button type="button" id="pasteSystemPrompt" class="px-2 py-1 text-xs rounded-md bg-gray-100 hover:bg-gray-200">Paste</button></div></div><textarea id="set_system_prompt" rows="8" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="Enter a system prompt to guide the sune"></textarea></div>
+          <p class="text-xs text-gray-500">Use <code>{{model_name}}</code> to insert the current model name, excluding the provider prefix, the first slash-separated segment, and any <code>:online</code> or <code>:free</code> suffixes.</p>
         </div>
         <div id="panelScript" class="p-1 hidden">
           <div class="border-b flex text-xs font-medium"><button type="button" id="htmlTab_index" class="flex-1 py-2 px-3 text-center border-b-2"></button><button type="button" id="htmlTab_extension" class="flex-1 py-2 px-3 text-center border-b-2"></button></div>
diff --git a/src/streaming.js b/src/streaming.js
index 96fd54d..a72953d 100644
--- a/src/streaming.js
+++ b/src/streaming.js
@@ -9,7 +9,8 @@ export const buildBody=()=>{
     msgs.push({role:'system', content: mPrompt});
   }
   
-  const sPrompt = (SUNE.system_prompt || '').trim();
+  const modelName=SUNE.model.replace(/^(or:|oai:|g:|cla:|cf:)/,'').replace(/^[^/]*\//,'').replace(/(?::online|:free)+$/,'');
+  const sPrompt = (SUNE.system_prompt || '').trim().replaceAll('{{model_name}}',()=>modelName);
   if(sPrompt) {
     msgs.push({role:'system', content: sPrompt});
   }