# GitHub Copilot: Disruption with some GitHub services
- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-09-15 09:47 UTC · Resolved: 2026-09-15 11:17 UTC · Duration: 1.5 h
- Updates: 7 · Affected components: Copilot AI Model Providers
- [Vendor status page: https://stspg.io/6pn81yd1x4hz](https://stspg.io/6pn81yd1x4hz)
- [Company: GitHub Copilot](https://rewindex.com/company/github-copilot.md)
## Timeline of updates
- **investigating** 2026-09-15 09:47 UTC: We are investigating reports of impacted performance for some GitHub services.
- **monitoring** 2026-09-15 09:48 UTC: 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.
- **investigating** 2026-09-15 10:20 UTC: Copilot AI Model Providers is experiencing degraded performance. We are continuing to investigate.
- **investigating** 2026-09-15 10:32 UTC: 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.
- **investigating** 2026-09-15 11:09 UTC: 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.
- **investigating** 2026-09-15 11:17 UTC: 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.
- **resolved** 2026-09-15 11:17 UTC: 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.
---
Canonical: https://rewindex.com/company/github-copilot/incidents/qwdwmtqghpk5 · Markdown: https://rewindex.com/company/github-copilot/incidents/qwdwmtqghpk5.md · JSON: https://rewindex.com/api/v1/companies/github-copilot/incidents/qwdwmtqghpk5 · Generated 2026-10-18T10:24:19.934Z