diff --git a/metagpt/const.py b/metagpt/const.py
index a14dbc5b8..8c1460a02 100644
--- a/metagpt/const.py
+++ b/metagpt/const.py
@@ -4,7 +4,7 @@
 @Time    : 2023/5/1 11:59
 @Author  : alexanderwu
 @File    : const.py'
-@Modified By: mashenquan, 2023/8/28. Add 'OPTIONS', 'DEFAULT_LANGUAGE'
+@Modified By: mashenquan, 2023/8/28. Add 'OPTIONS', 'DEFAULT_LANGUAGE', 'DEFAULT_MAX_TOKENS'
 """
 import contextvars
 from pathlib import Path
@@ -40,3 +40,4 @@ MEM_TTL = 24 * 30 * 3600
 
 OPTIONS = contextvars.ContextVar("OPTIONS")
 DEFAULT_LANGUAGE = "English"
+DEFAULT_MAX_TOKENS = 1500
\ No newline at end of file
diff --git a/metagpt/provider/openai_api.py b/metagpt/provider/openai_api.py
index 45e67739b..7dba00530 100644
--- a/metagpt/provider/openai_api.py
+++ b/metagpt/provider/openai_api.py
@@ -19,7 +19,7 @@ from pydantic import BaseModel
 from tenacity import retry, stop_after_attempt, after_log, wait_fixed, retry_if_exception_type
 
 from metagpt.config import CONFIG
-from metagpt.const import DEFAULT_LANGUAGE
+from metagpt.const import DEFAULT_LANGUAGE, DEFAULT_MAX_TOKENS
 from metagpt.logs import logger
 from metagpt.provider.base_gpt_api import BaseGPTAPI
 from metagpt.utils.token_counter import (
@@ -303,7 +303,7 @@ class OpenAIGPTAPI(BaseGPTAPI, RateLimiter):
     async def get_context_title(self, text: str, max_token_count_per_ask=None, max_words=5) -> str:
         """Generate text title"""
         max_response_token_count = 50
-        max_token_count = max_token_count_per_ask or CONFIG.MAX_TOKENS or 1500
+        max_token_count = max_token_count_per_ask or CONFIG.MAX_TOKENS or DEFAULT_MAX_TOKENS
         text_windows = self.split_texts(text, window_size=max_token_count - max_response_token_count)
 
         summaries = []