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GitHub Copilot: Elevated errors on Fable 5 due to upstream provider

Impact: majorStatus: resolvedStarted Resolved (47 min)3 updatesSource: stspg.io (opens in new tab)
Summary

GitHub Copilot reported a major degradation affecting Claude Fable 5, with elevated errors and requests failing mid-response; no other models were impacted. The incident started at 2026-08-24 07:12 UTC and was resolved at 2026-08-24 07:58 UTC, lasting 46 min. An upstream provider issue caused the disruption, and the provider applied a mitigation.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: Copilot AI Model Providers

Timeline of updates

  1. investigating

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

  2. investigating

    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.

  3. resolved

    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.

Rewindex changes for this incident

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). GitHub Copilot profile · Recent GitHub Copilot incidents · Markdown · JSON