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ChatGPT: Error in message stream

A reply stops while it is being delivered.

Quick answer

“Error in message stream” appeared while ChatGPT was sending a reply. The message does not identify one cause. Save any visible answer before refreshing, then compare a simple prompt in a new chat with the conversation that failed.

Exact message

Error in message stream

What it means

Start by checking what was delivered. The reply may be cut off even though the conversation still opens. In an October 2026 community report, a user saw the error in both the browser and macOS app after reinstalling and restarting. OpenAI Support said an incident on the first day had been resolved and suggested a new chat, private window, another network, and another device for the continuing problem. The thread does not report a confirmed fix.

What to try

  1. Copy the useful part of the reply if it is still visible. Reopening or refreshing may leave you with less text than you saw during generation.
  2. Send a short text-only request in a new chat. If that works, compare it with the original conversation before changing network settings.
  3. Check OpenAI status for the time of the error. If the problem persists, try a private window with extensions off, then another network or device. Give support the exact time, client, and affected conversation URL privately.

User report

The October reporter had already reinstalled the macOS app and restarted the computer and router. They said the error still appeared in nearly every chat. OpenAI Support’s reply offered further checks, but the visible thread does not say which one, if any, solved it.

FAQ

Was my reply saved?

Open the conversation and read the last assistant message all the way to its end. If it stops mid-sentence or the response is absent, do not assume the missing portion exists somewhere in the chat. Copy what remains before trying again. If the same prompt produced a file or changed data, check that result separately before repeating the action.

Should I retry the whole prompt?

For a plain text question, a retry is reasonable after you save the partial answer. For a task that sent emails, generated files, or changed another service, first check whether the action already happened. A short new-chat test can tell you whether ChatGPT can answer at all; it does not prove the original conversation is healthy.

Is this the same as an unloaded conversation?

No. Here the chat opens, but a new reply breaks while arriving. “Unable to load conversation” appears when saved history will not open. That difference changes what to check first: for a stream error, preserve the partial answer; for an unloaded conversation, keep the conversation URL and compare access from another client.

Sources