Changes / GitHub / Elevated errors on Fable 5 due to upstream provider
GitHub: Major incident: Elevated errors on Fable 5 due to upstream provider
Summary
GitHub reported a major degradation affecting Claude Fable 5 in Copilot products and IDE surfaces, 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. GitHub attributed it to an upstream provider issue, resolved through the provider’s mitigation.
Machine-written from the diff below (Sol; type: incident degradation). Check the diff before relying on it.
What changed
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After: Elevated errors on Fable 5 due to upstream provider
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After: major
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After: resolved
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After: 2026-08-24 07:12 UTC
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After: 2026-08-24 07:58 UTC
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After: Copilot AI Model Providers
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After: We are investigating reports of degraded availability for Copilot AI Model Providers
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After: 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.
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After: 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.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Elevated errors on Fable 5 due to upstream provider (this change) GitHub reported a major degradation affecting Claude Fable 5 in Copilot products and IDE surfaces, 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. GitHub attributed it to an upstream provider issue, resolved through the provider’s mitigation. | Major incident |