GitHub change history: Elevated errors on Fable 5 due to upstream provider

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.