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GitHub Copilot: Elevated rate of errors for OpenAI models provided by Copilot
GitHub Copilot · github.comImpact: minorResolved2026-09-17 21:49 UTC
Public — what happened
Summary
Between 20:26 and 21:17 UTC on September 17, 2026, GitHub Copilot experienced degradation affecting several GPT models, including GPT-5.6 Luna, GPT-5.6 Terra, GPT-5.6 Sol, GPT-5.3-Codex, and GPT-6 Astra. Users encountered elevated error rates when using these models.<br /><br />The degradation was caused by an issue with an upstream model provider. GitHub engineers detected the issue through automated monitoring and coordinated with the provider. Our automated model-warning system activated in-product warnings for affected models during the incident. Service returned to normal after the provider implemented a mitigation.
Timeline
- Started — 2026-09-17 20:59 UTC
- Last update — 2026-09-17 21:49 UTC
- Resolved — 2026-09-17 21:49 UTC
With SquidGrid — where it starts on the route
Independent path health
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