What the message means
ChatGPT works with a limited amount of context for each reply, called the context window. When the chat outgrows that space, ChatGPT can't add another message next to the old ones, so it stops and tells you to start a new chat.
That's not the same as a usage limit. A usage limit stops you for a while and comes with a reset time. The maximum length stops this one chat, for good.
"It happens sooner than before": what users reported
On October 4, 2026, a user opened a thread on the OpenAI Developer Community forum saying their conversations were reaching the maximum length after about 50 to 60% of the content they could fit before. Others in the thread reported the same thing.
On October 18, OpenAI's support account replied in the thread: "We're looking into whether this is a widespread issue or something account-specific."
That's where things stand as far as that thread goes: user reports, and OpenAI looking into it. It isn't a confirmed change, and we don't know the cause. What we do know is that ChatGPT is widely used here: 44% of US adults say they use it, according to a Pew Research Center survey from February 2026. So a full chat is a common problem, whatever the limit is today.
What you can and can't do with the full chat
- You can still open it, scroll it, read it and copy from it. Nothing is deleted.
- You can't add new messages to it, and no setting makes it longer.
- Retrying won't help. The chat stays full.
So the goal isn't to rescue the old chat. It's to start a new one that already knows what matters.
Keep going in a new chat, in four steps
- Write the goal in one line. What are you working on?
- List what's decided, so the new chat doesn't reopen it.
- Add the rules you kept repeating: the tone, the format, what to avoid.
- Paste the latest version of the work, then ask it to continue, not to start over.
Keep it short. Pasting the whole old chat into the new one just fills it up again.
A new chat isn't a downgrade.
Near the end, a full chat spends its space re-reading a long history. A new chat with a short, clear handoff has room to work, with your settled decisions stated clearly for you to check.
The faster way: let Uncook write the handoff
Uncook's Handoff writes that message for you. On the ChatGPT page, click the Uncook icon: it picks up the chat, even one that reached its maximum length. Pick Handoff. You get a prompt with your goal, what's decided, the rules you set and where you stopped.
Read it, change what you want, then copy it into a new chat.
Because a handoff is plain text, you can also continue in Claude, Gemini or another AI.
Questions people ask
Is OpenAI shrinking the conversation length? We don't know. Users reported it in October 2026, and OpenAI said it was looking into whether the issue was widespread or account-specific. Nothing more is confirmed on that thread.
Will a paid plan fix it? A full chat stays full. Plans and models can differ in how much fits in a chat, but every chat has a limit.
Does Uncook make the chat longer? No. It reads the full chat and writes a prompt to carry what matters into a new one.
Start fresh,
without starting over.
Add to Chrome
We don't keep the conversations you bring. When you click Send to Uncook in the extension window, the extension sends the chat from your tab to our servers, encrypted, for up to 30 minutes, and we delete it as soon as your Uncook page opens it. What Uncook makes from it is kept as a task, for as long as our Privacy page says. Neither your chats nor your tasks are used to train AI models.