GitHub outage on September 15, 2026: Disruption with some GitHub services
GitHub reported an incident affecting GitHub for 1 hour 30 minutes on 15 September 2026, from 09:47 to 11:17 UTC.
Resolved
Official incident reported by GitHub
- Started
- 09:47
- 15 Sep 2026 UTC
- Resolved
- 11:17
- 15 Sep 2026 UTC
- Duration
- 1h 30m
- 1 hour 30 minutes
- Impact
- Minor
- as rated by GitHub
- Updates
- 7
- posted by GitHub
Timeline
All times UTC.
Official incident from GitHub
Disruption with some GitHub services
-
Official
Investigating
We are investigating reports of impacted performance for some GitHub services.
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Official
Monitoring
We are investigating degraded availability for Claude Fable 5.1, affecting some Copilot products and integrated development environments. The issue is caused by a problem with our upstream model provider. Customers can use another model or select Auto while we investigate.
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Official
Investigating
Copilot AI Model Providers is experiencing degraded performance. We are continuing to investigate.
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Official
Investigating
We continue to investigate intermittent errors affecting Claude Fable 5.1 in some Copilot products and integrated development environments. Customers can use another model or select Auto while we monitor the situation.
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Official
Investigating
We continue to monitor intermittent errors affecting Claude Fable 5.1 in some Copilot products and integrated development environments. Customer-facing metrics have recovered, and we are awaiting confirmation from our upstream provider that the issue will not recur. Customers can select another model or Auto in the meantime.
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Official
Investigating
The issues with our upstream model provider have been resolved, and Claude Fable 5.1 is once again available in Copilot products and IDE surfaces. We will continue monitoring to ensure stability, but mitigation is complete.
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Official
Resolved
On September 15, 2026, between 05:45 and 09:50 UTC, the Claude Fable 5.1 model in GitHub Copilot experienced intermittently degraded availability, with an average error rate of 2.8%. During brief recurring 15 minute periods that recurred every ~45 minutes, availability for Claude Fable 5.1 dropped to a maximum of ~40% before recovering completely. Other Copilot models were not affected. Users could continue to work with a different model or with 'Auto'. The cause was an issue with an upstream model provider that intermittently rejected requests while overloaded. GitHub worked with the provider, who acknowledged and then resolved the underlying issue at 9:50 UTC, after which the model returned to constant normal availability. Once recovery was guaranteed, we resolved the incident at 11:17 UTC. To reduce the chance of recurrence and customer impact, GitHub is reviewing per-model availability alerting and automatic in-product fallback so that requests to a degraded model can shift to a healthy alternative more quickly.
"Official" rows are quoted from GitHub's public status page, www.githubstatus.com. Very long posts are shortened.
What our checkpoints saw
HostTracker's checkpoints, which test github.com from several locations, recorded no outage of 5 minutes or longer during this incident. A provider can report a problem that affects only some features, regions or accounts, which a check of the main address does not see. The live GitHub status shows what our checks see right now.
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Independent measurement by HostTracker. Not affiliated with GitHub. Official updates are quoted from GitHub's public status page and remain GitHub's own words.