diff --git a/requirements-dev.txt b/requirements-dev.txt
index c3df15686..7bcbd8251 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -22,3 +22,4 @@ wlc==1.13
 coloredlogs==15.0.1
 requests
 markdown
+tiktoken
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 0cff50be3..016484508 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,4 +17,5 @@ markdown-it-py==2.1.0
 typing_extensions==4.5.0
 fasttext-predict==0.9.2.1
 requests
-markdown
\ No newline at end of file
+markdown
+tiktoken
\ No newline at end of file
diff --git a/searx/webapp.py b/searx/webapp.py
index c13931102..337847d2f 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -17,6 +17,7 @@ import requests
 import markdown
 import re
 import datetime
+import tiktoken
 
 from timeit import default_timer
 from html import escape
@@ -767,7 +768,7 @@ def search():
             res['content'] = res['content'].replace("This Tweet was deleted by the Tweet author.","Deleted  Tweet.")
              
             tmp_prompt =  res['title'] +'\n'+  res['content'] + '\n' + new_url +'\n'
-            if len(prompt)+len(tmp_prompt)<2300:
+            if len( tiktoken.get_encoding("gpt2").encode(prompt + tmp_prompt +'\n' + "\n以上是问题 " + original_search_query + " 的搜索结果，删除与问题相关度低的内容，用简体中文分条总结简报，在文中用(链接)标注对应内容来源链接，不要把链接都放在最后。结果：") )<2990:
                 prompt += tmp_prompt +'\n'
         if prompt != "":
             gpt = ""