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Elevated errors on Fable 5 due to upstream provider

ResolvedmajorOfficial source confirmedSpecific component onlyFirst recorded update Aug 24, 2026, 07:12 AM · Resolved Aug 24, 2026, 07:58 AM

On August 24th, 2026, between approximately 06:35 and 07:25 UTC, the Copilot service experienced a degradation of the Claude Fable 5 model due to an issue with our upstream provider. Users encountered elevated error rates when using Claude Fable 5, with requests sometimes failing mid-response. No other models were impacted.<br /><br />The issue was resolved by a mitigation put in place by our provider. GitHub is working with our provider to further improve the resiliency of the service to prevent similar incidents in the future.

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What visitors reported during this incident

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Affected services

Copilot AI Model Providers

Updates (3)

  1. Aug 24, 2026, 07:58 AM
    Elevated errors on Fable 5 due to upstream provider

    On August 24th, 2026, between approximately 06:35 and 07:25 UTC, the Copilot service experienced a degradation of the Claude Fable 5 model due to an issue with our upstream provider. Users encountered elevated error rates when using Claude Fable 5, with requests sometimes failing mid-response. No other models were impacted.<br /><br />The issue was resolved by a mitigation put in place by our provider. GitHub is working with our provider to further improve the resiliency of the service to prevent similar incidents in the future.

    GitHub ↗
  2. Aug 24, 2026, 07:12 AM
    Elevated errors on Fable 5 due to upstream provider

    We are experiencing degraded availability for the Fable model in Copilot products and IDE surfaces. This is due to an issue with the upstream model provider. While we work with them to resolve the issue, we recommend choosing another model or selecting 'Auto' to continue using Copilot.

    GitHub ↗
  3. Aug 24, 2026, 07:12 AM
    Elevated errors on Fable 5 due to upstream provider

    We are investigating reports of degraded availability for Copilot AI Model Providers

    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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