diff --git a/crazy_functions/latex_fns/latex_actions.py b/crazy_functions/latex_fns/latex_actions.py
index 113a27853..b43d7d2fb 100644
--- a/crazy_functions/latex_fns/latex_actions.py
+++ b/crazy_functions/latex_fns/latex_actions.py
@@ -404,7 +404,7 @@ def 编译Latex(chatbot, history, main_file_original, main_file_modified, work_f
             result_pdf = pj(work_folder_modified, f'merge_diff.pdf')    # get pdf path
             promote_file_to_downloadzone(result_pdf, rename_file=None, chatbot=chatbot)  # promote file to web UI
         if modified_pdf_success:
-            yield from update_ui_lastest_msg(f'转化PDF编译已经成功, 即将退出 ...', chatbot, history)    # 刷新Gradio前端界面
+            yield from update_ui_lastest_msg(f'转化PDF编译已经成功, 正在尝试生成对比PDF, 请稍后 ...', chatbot, history)    # 刷新Gradio前端界面
             result_pdf = pj(work_folder_modified, f'{main_file_modified}.pdf') # get pdf path
             origin_pdf = pj(work_folder_original, f'{main_file_original}.pdf') # get pdf path
             if os.path.exists(pj(work_folder, '..', 'translation')):
diff --git a/toolbox.py b/toolbox.py
index 8d9103514..bb4ec6671 100644
--- a/toolbox.py
+++ b/toolbox.py
@@ -1007,14 +1007,19 @@ def clip_history(inputs, history, tokenizer, max_token_limit):
     def get_token_num(txt): 
         return len(tokenizer.encode(txt, disallowed_special=()))
     input_token_num = get_token_num(inputs)
+
+    if max_token_limit < 5000:   output_token_expect = 256  # 4k & 2k models
+    elif max_token_limit < 9000: output_token_expect = 512  # 8k models
+    else: output_token_expect = 1024                        # 16k & 32k models
+
     if input_token_num < max_token_limit * 3 / 4:
         # 当输入部分的token占比小于限制的3/4时，裁剪时
         # 1. 把input的余量留出来
         max_token_limit = max_token_limit - input_token_num
         # 2. 把输出用的余量留出来
-        max_token_limit = max_token_limit - 128
+        max_token_limit = max_token_limit - output_token_expect
         # 3. 如果余量太小了，直接清除历史
-        if max_token_limit < 128:
+        if max_token_limit < output_token_expect:
             history = []
             return history
     else: