diff --git a/metagpt/roles/assistant.py b/metagpt/roles/assistant.py
index 9c80593f6..018a1fb01 100644
--- a/metagpt/roles/assistant.py
+++ b/metagpt/roles/assistant.py
@@ -125,7 +125,7 @@ class Assistant(Role):
             return None
         if history_text == "":
             return last_talk
-        history_summary = await self._llm.get_summary(history_text, max_words=500)
+        history_summary = await self._llm.get_summary(history_text, max_words=800)
         await self.memory.set_history_summary(
             history_summary=history_summary, redis_key=CONFIG.REDIS_KEY, redis_conf=CONFIG.REDIS
         )