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[Backfill] US - Incident with Copilot GPT-5.1-Codex

At a glance · GitHub's status

ResolvedLasted 1 h 39 min

First posted
on GitHub Enterprise Cloud data residency status
Ended
· marked resolved
Affects
GitHub Enterprise Cloud US
Edited
Not since we first saw it
Source
GitHub Enterprise Cloud data residency status · checked 1 min ago

In short

GitHub reported a partial outage affecting GitHub Enterprise Cloud US, starting 10:02 UTC on 20 Feb. GitHub marked it resolved at 11:41 UTC after 1 h 39 min. GitHub has since published a post-incident report.

GitHub says

GitHub's latest update, , in short excerpts.

On February 20, 2026, between 07:30 UTC and 11:21 UTC, the Copilot service experienced a degradation of the GPT 5.1 Codex model.

GitHub,

Read the full update on GitHub's status page

Timeline

Times in UTC, GitHub's own where it gives them.

  1. 20 Feb

    GitHubFirst public postFrom GitHub's own incident history, before our archive started.

  2. +1 h 39 min

    GitHubResolved

What GitHub changed

GitHub adds updates to its incidents. We save every version (checked every minute) and list what changed. Quotes are short excerpts. The full text is on GitHub's page.

One version so far. If GitHub edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    As first seen: postmortem · 1 service
    Status
    postmortem
    Services
    GitHub Enterprise Cloud US

    Seen by us · GitHub's timestamp · GitHub's page

Affected services

Official updates

Posted by GitHub Enterprise Cloud data residency status, newest first. The newest are quoted in their first sentence; the full text of each is on GitHub's page.

  1. Post-incident report ·

    On February 20, 2026, between 07:30 UTC and 11:21 UTC, the Copilot service experienced a degradation of the GPT 5.1 Codex model.

  2. Resolved ·

    This incident has been resolved.

  3. Investigating ·

    The issues with our upstream model provider have been resolved, and GPT 5.1 Codex is once again available in Copilot Chat and across IDE integrations…

  4. Investigating ·

    We are still experiencing degraded availability for the GPT 5.1 Codex model in Copilot Chat, VS Code and other Copilot products.

  5. Investigating ·

    We are experiencing degraded availability for the GPT 5.1 Codex model in Copilot Chat, VS Code and other Copilot products.

  6. Investigating ·

    We are investigating reports of degraded performance for Copilot

Read the full update on GitHub's status page

Last updated