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When to start a new chat with ChatGPT or Claude

Long chats feel productive, but past a point they make the answers worse. Here is how to tell it is time, and how to switch without starting from zero.

Six signs it is time

1. It forgets what you said. Rules or requirements from early in the chat stop being followed.
2. It contradicts itself. New answers clash with earlier ones.
3. It repeats rejected ideas. A fix you already ruled out comes back.
4. Corrections do not stick. You fix the same thing twice.
5. Replies slow down or get generic. Very long conversations can be slower and less consistent.
6. You changed topic. If the new subject is unrelated, an old chat only adds noise.

A rule of thumb: 50 to 70 percent

Quality tends to slip before the hard limit, so waiting until the window is full is too late. A simple habit is to wrap up the current thread at about 50 percent and hand off by 70 percent. That is the default amber and red level in ContextMeter, and you can change both. The percentage only helps if you can see it, which is the whole reason the extension exists.

Count tokens, not messages

You will see advice like "start fresh after 20 messages". It is a rough guide at best, because a single large paste can use more of the window than fifty short messages. Check size, not count. The token counter shows how much of each window a block of text takes.

How to switch without losing progress

1. In the old chat, send the handoff prompt. It asks for the goal, decisions, constraints and next steps.
2. Open a new chat and paste the summary with the starter message from the same page.
3. Check that the new chat restates the key facts correctly before you continue.

Do not paste the whole old transcript. That drags stale decisions and dead ends into the new chat along with the useful state.

Frequently asked questions

When should I start a new chat with ChatGPT or Claude?

When you change topic, when the answers start forgetting or contradicting earlier decisions, and when a meter shows you have used roughly half to 70 percent of the window.

How many messages is too many?

There is no fixed number. Guides suggest trouble from 20 or more messages on a complex topic, but long messages use up the window far faster than short ones. Measure tokens, not messages.

Will I lose my progress if I start a new chat?

Only if you do not carry it over. Ask the AI for a structured summary first and paste it into the new chat.

Last reviewed 2026-10-08. Numbers change often; see the sources linked on this page.