Disruption with GPT 5.3 Codex
At a glance · GitHub's status
ResolvedLasted 2 h 33 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 just now
In short
GitHub reported a partial outage affecting GitHub Enterprise Cloud US, starting 16:03 UTC on 20 Jul. GitHub marked it resolved at 18:37 UTC after 2 h 33 min. GitHub has since published a post-incident report.
GitHub says
GitHub's latest update, , in short excerpts.
Between 06:39 and 18:11 UTC on July 20, 2026, the Copilot service experienced a degradation of the GPT 5.3 model due to an issue with…
Timeline
Times in UTC, GitHub's own where it gives them.
20 Jul
GitHubFirst public postFrom GitHub's own incident history, before our archive started.
+2 h 33 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.
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.
Post-incident report ·
Between 06:39 and 18:11 UTC on July 20, 2026, the Copilot service experienced a degradation of the GPT 5.3 model due to an issue with…
Resolved ·
This incident has been resolved.
Investigating ·
We are seeing signs of sustained recovery from the upstream provider for GPT 5.3 Codex requests.
Investigating ·
The upstream provider continues to return intermittent errors for GPT 5.3 Codex requests.
Investigating ·
We identified that an upstream provider is returning errors for GPT 5.3 Codex requests, causing some users to experience failed or interrupted responses.
Investigating ·
We are investigating GPT Codex 5.3 performance.
Investigating ·
We are investigating reports of degraded performance for Copilot AI Model Providers
Last updated