Is GitHub down? › Outage history › Sep 16, 2026
GitHub partial outage on Sep 16, 2026: what happened
On Sep 16, 2026, the GitHub status page reported "Degradation with Gemini 3.8 Flash". About 10 hours 28 min: from Sep 16, 2026, 07:20 UTC to Sep 16, 2026, 17:48 UTC, by the official start and resolution times.
GitHub right now
At our last refresh (Oct 22, 2026, 12:35 UTC) GitHub was up: All Systems Operational.
- Started
- Sep 16, 2026, 07:20 UTC
- Resolved
- Sep 16, 2026, 17:48 UTC
- Duration
- 10 hours 28 min
- Official impact
- Major
- Affected
- Copilot AI Model Providers
- Source
- Degradation with Gemini 3.8 Flash on the GitHub status page
The GitHub status page rated the impact "Major": a partial outage. Some parts or some users were affected; it was not a complete outage.
What caused the GitHub partial outage?
"The degradation was caused due to a capacity issue with an upstream model provider."
From the GitHub status page, Sep 16, 2026, 17:48 UTC.
When was it fixed?
The GitHub status page marked it resolved at Sep 16, 2026, 17:48 UTC, 10 hours 28 min after it started. A fix was in place and being monitored from Sep 16, 2026, 11:45 UTC. Its resolution note: "On September 16, 2026, between 04:40 and 11:45 UTC, the Gemini 3.8 Flash model in GitHub Copilot experienced degraded availability. Requests to this model failed at an average rate of 6.4%, and the impact was highest during peak traffic hours. Other Copilot models were not affected. Users could ..."
Timeline of official updates
Every update the GitHub status page posted, oldest first. Times are UTC.
Sep 16, 2026, 07:21 UTC investigating
We are investigating reports of degraded availability for Copilot AI Model Providers
Sep 16, 2026, 08:28 UTC investigating
Copilot AI Model Providers is experiencing degraded performance. We are continuing to investigate.
Sep 16, 2026, 10:58 UTC investigating
Copilot AI Model Providers is experiencing degraded performance. We are continuing to investigate.
Sep 16, 2026, 11:45 UTC monitoring
The degradation affecting Copilot AI Model Providers has been mitigated. We are monitoring to ensure stability.
Sep 16, 2026, 17:48 UTC resolved
On September 16, 2026, between 04:40 and 11:45 UTC, the Gemini 3.8 Flash model in GitHub Copilot experienced degraded availability. Requests to this model failed at an average rate of 6.4%, and the impact was highest during peak traffic hours. Other Copilot models were not affected. Users could continue to work with a different model or with 'Auto'. The degradation was caused due to a capacity issue with an upstream model provider. Failure rates returned to normal as the daily traffic peak passed. We monitored the model until it was healthy and resolved the incident at 17:48 UTC. We are working to make our systems resilient to cover peak demand for all the Copilot models.
GitHub partial outage questions
What caused the GitHub partial outage on Sep 16, 2026?
The GitHub status page said (update at Sep 16, 2026, 17:48 UTC): "The degradation was caused due to a capacity issue with an upstream model provider."
When was the GitHub partial outage on Sep 16, 2026 fixed?
The GitHub status page marked it resolved at Sep 16, 2026, 17:48 UTC, 10 hours 28 min after it started. A fix was in place and being monitored from Sep 16, 2026, 11:45 UTC. Its resolution note: "On September 16, 2026, between 04:40 and 11:45 UTC, the Gemini 3.8 Flash model in GitHub Copilot experienced degraded availability. Requests to this model failed at an average rate of 6.4%, and the impact was highest during peak traffic hours. Other Copilot models were not affected. Users could ..."
How long did the GitHub partial outage last?
About 10 hours 28 min: from Sep 16, 2026, 07:20 UTC to Sep 16, 2026, 17:48 UTC, by the official start and resolution times.
Was GitHub completely down?
No. The GitHub status page rated the impact "Major": a partial outage. Some parts or some users were affected; it was not a complete outage. The affected parts listed were: Copilot AI Model Providers.
Which parts of GitHub were affected?
The GitHub status page listed: Copilot AI Model Providers.
Other recent GitHub incidents
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- [Retroactive] Actions workflow run logs delayed Oct 14, 2026, 00:12 UTC, duration not stated
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Quotes are the GitHub status page's own words, from the official incident. Is It Up or Down is independent and not affiliated with GitHub. Times are UTC.