I pushed Chat GPT toward its hidden chat limit — here's what actually happens when you reach it | Tech Radar
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I pushed Chat GPT toward its hidden chat limit — here's what actually happens when you reach it
Long-running Chat GPT conversations will eventually shut down
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You might not be aware, but your Chat GPT chat sessions have a hard limit. They can only go on for so long before you reach it. Confusingly there seem to be two types of limit as well. The first is to do with memory.
The memory limit (how much of the current chat that Chat GPT can remember for context) is not measured in time, or the number of messages you’ve typed, but in things called tokens.
A token is roughly 0.75 words in English, on average, so "The cat sat on the mat", which is six words, is about seven to nine tokens. Long responses, large tables, code, and detailed documents can consume far more tokens than short text exchanges.
What matters is the model's context window: this is the total number of tokens it can consider at once, and it will vary depending on the model you’re using.
Open AI does not publicly document the context window for every model available in Chat GPT, but it is likely to be measured in hundreds of thousands of tokens. But if you reach it, then you can expect Chat GPT to start forgetting things from the start of your conversation.
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Of course, if Chat GPT simply becoming forgetful about things way back at the start of the conversation was all that happened then there’d be no need to be alarmed. But as one Reddit user found out, there is another limit, that’s much more serious — Chat GPT can actually end a chat if it becomes too long.
When this happens you simply get a message saying, “You've reached the maximum length for this conversation, but you can keep talking by starting a new chat."
Despite there being no official documented chat length from Open AI, there are a lot of reports and screenshots of this warning message, so while the evidence is anecdotal, it seems genuine and I think it’s still wise to act on it.
I’ve got one very long chat thread I use a lot in Chat GPT, pretty much every day, and I started to wonder when it was going to hit the limit, so I asked Chat GPT if the current chat was near the limits of its context window, and it said:
“I can't see the exact token count or the hard limit for this conversation, so I can't tell you "you're at 78%" or similar. That said, based on the amount of text in this thread, I'd estimate we're well past the halfway point and probably somewhere in the 60–80% range of what a typical long GPT-5.5 chat can comfortably hold before older context starts getting compressed or dropped.”
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Chat GPT did estimate: “If I had to put a number on it, I'd say around 70% full, plus or minus quite a lot because Open AI doesn't expose the actual count.”
So, it was probably time I started to think about opening a new chat based on the same subject.
A chat thread can start to feel less like a sequence of prompts and more like a shared workspace that will always be there. In reality, it is still a temporary container with a maximum capacity. Eventually, the conversation gets too large, the context becomes harder to maintain, and the chat reaches the end of the road.
Basically, your only option to preserve the chat is to recreate it in a new chat window. That way your token usage resets to zero, and so does the conversation-length limit. Of course, you will lose a lot of the subtle bias or influence from the previous chat content, but it’s still your best option.
Because I’m getting near the limit of my chat, but not quite there yet, I’m at just the right point to do this now. The key thing is to do it early, before you hit your limit and it is too late to ask any more questions.
To recreate the chat, simply ask Chat GPT to create a prompt to recreate the current chat, then copy and paste what it produces into a new chat window at a time that’s convenient. Try this prompt: "Summarize everything important about this chat and create a starter prompt that recreates the context in a new conversation."
If you have a Chat GPT conversation you've been using for months, it might be worth asking the AI to summarize it now rather than later. Because when the warning message finally appears, your only real option is to start over — and by then, the chance to recreate the exact chat may already be gone.
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Graham is the Senior Editor for AI at Tech Radar. With over 25 years of experience in both online and print journalism, Graham has worked for various market-leading tech brands including Computeractive, PC Pro, i More, Mac Format, Mac|Life, Maximum PC, and more. He specializes in reporting on everything to do with AI and has appeared on BBC TV shows like BBC One Breakfast and on Radio 4 commenting on the latest trends in tech. Graham has an honors degree in Computer Science and spends his spare time podcasting and blogging.
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