diff --git a/telegram/bot.py b/telegram/bot.py
index 67f2e75..a7483b5 100644
--- a/telegram/bot.py
+++ b/telegram/bot.py
@@ -100,7 +100,8 @@ CONVERSATION_WINDOW = 5  # expire after 5 unanswered messages
 unanswered_count: dict[tuple[int, int], int] = {}  # (chat_id, user_id) → unanswered count
 
 # Conversation history — last N exchanges for prompt context (Ganymede: high-value change)
-MAX_HISTORY = 5
+MAX_HISTORY_USER = 5
+MAX_HISTORY_CHAT = 10  # Ganymede: group chats need more context (multiple users)
 conversation_history: dict[tuple[int, int], list[dict]] = {}  # (chat_id, user_id) → [{user, bot}]
 
 
@@ -694,13 +695,13 @@ IMPORTANT: Two special tags you can append at the end of your response (after yo
         # Per-user history
         history = conversation_history.setdefault(key, [])
         history.append(entry)
-        if len(history) > MAX_HISTORY:
+        if len(history) > MAX_HISTORY_USER:
             history.pop(0)
         # Chat-level history (group context — all users visible)
         chat_key = (msg.chat_id, 0)
         chat_history = conversation_history.setdefault(chat_key, [])
         chat_history.append(entry)
-        if len(chat_history) > MAX_HISTORY:
+        if len(chat_history) > MAX_HISTORY_CHAT:
             chat_history.pop(0)
 
     # Record rate limit