Why does the AI forget earlier parts of a long chat?

Each model can only read a certain amount of text at once. As a chat grows, older messages are summarized automatically so the conversation can continue. The summary keeps the main points, but some details may be lost.

How you can tell

• While it happens, the chat shows Compacting conversation….
• Afterwards you see Summarized [number] earlier messages. Click Show full history to see the older messages again, or Show summary to read the summary.
• When a chat is getting full, a Memory chip with a percentage can appear next to the model name in the message box. Click it to see Conversation memory and how much space is left.

Coming back to a large chat

When you return to a large chat, you may be asked How would you like to continue?

• Start new chat: begin fresh. Nothing from this chat carries over.
• Continue from summary: older messages are condensed into a short summary and recent ones are kept. This uses far less of your limit.
• Resume as is with the current model: the whole history is sent as it is. Nothing is lost, but it uses a large part of your limit.

Keep important details

• Start a New Chat for a new topic.
• Repeat key facts, or paste them again, when they matter.