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Disruption with some GitHub services

ResolvedminorOfficial source confirmedSpecific component onlyFirst recorded update Sep 15, 2026, 09:47 AM · Resolved Sep 15, 2026, 11:17 AM

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'.<br /><br />The cause was an issue with an upstream model provider that intermittently rejected requests while overloaded. GitHub worked...

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Affected services

Copilot AI Model Providers

Updates (7)

  1. Sep 15, 2026, 11:17 AM
    Disruption with some GitHub services

    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'.<br /><br />The cause was an issue with an upstream model provider that intermittently rejected requests while overloaded. GitHub worked with t

    GitHub ↗
  2. Sep 15, 2026, 11:17 AM
    Disruption with some GitHub services

    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.<br /><br />We will continue monitoring to ensure stability, but mitigation is complete.

    GitHub ↗
  3. Sep 15, 2026, 11:09 AM
    Disruption with some GitHub services

    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.

    GitHub ↗
  4. Sep 15, 2026, 10:32 AM
    Disruption with some GitHub services

    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.

    GitHub ↗
  5. Sep 15, 2026, 10:20 AM
    Disruption with some GitHub services

    Copilot AI Model Providers is experiencing degraded performance. We are continuing to investigate.

    GitHub ↗
  6. Sep 15, 2026, 09:48 AM
    Disruption with some GitHub services

    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.

    GitHub ↗
  7. Sep 15, 2026, 09:47 AM
    Disruption with some GitHub services

    We are investigating reports of impacted performance for some GitHub services.

    GitHub ↗

What to do next

  • Verify your own services recovered cleanly. Some upstream outages leave queues or caches in a degraded state, run smoke tests before declaring green internally.
  • Save the post-mortem. Vendors usually publish a detailed RCA 1-3 days later. We'll add it to this page when it appears.
  • Watch the provider going forward. Follow GitHub's status feed →

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