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GitHub Copilot reported a 51-minute outage affecting OpenAI models due to an upstream provider error

clearly official source

GitHub Copilot reported elevated error rates on 17 September 2026 between 20:26 and 21:17 UTC (51 minutes) for GPT-5.6 Luna, Terra, Sol, GPT-5.3-Codex and GPT-6 Astra due to an error at the upstream provider. After the provider intervened, the service returned to normal.

Between 20:26 and 21:17 UTC on 17 September 2026, a period of 51 minutes, GitHub Copilot experienced elevated error rates for several GPT models: GPT-5.6 Luna, GPT-5.6 Terra, GPT-5.6 Sol, GPT-5.3-Codex and GPT-6 Astra. Users of these models in Copilot products and IDE interfaces encountered errors.

According to GitHub, the problem was caused by an error on the upstream model provider side. GitHub engineers detected the problem through automated monitoring and coordinated its resolution with the provider. Throughout the incident, an automated in-product warning system displayed alerts to users for the affected models and recommended choosing another model or the 'Auto' option. The service returned to normal after the provider implemented a corrective measure.

What changed

Why it matters

Developers using the affected models during the incident had a workaround available by switching to another model or the 'Auto' option; the incident also demonstrates that the availability of AI features in Copilot depends on the infrastructure of an external model provider, not just on GitHub itself.

Two audiences, two different impacts

What this means

01

For individuals

GitHub Copilot users who encountered errors with GPT-5.6 Luna, GPT-5.6 Terra, GPT-5.6 Sol, GPT-5.3-Codex or GPT-6 Astra during that window could work around the problem by selecting another model or the 'Auto' option.

What to do When specific models in Copilot return errors, check GitHub Status and temporarily switch to another model or the 'Auto' option.
More practical updates →
02

For a business

The outage showed that the reliability of GitHub Copilot depends on the upstream provider of OpenAI models – the 51-minute degradation affected development teams using the affected models until the provider implemented a fix.

Productivity
What to decide Teams that rely heavily on GitHub Copilot can monitor the GitHub Status page and have a procedure ready for switching to another model during brief outages.
More business impacts →
Copilot dostupnost GitHub Copilot GitHub Status GPT GPT-5.6 IDE incident nedostupnost OpenAI outage outage

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Event sources

clearly official source · 1 publisher, 0 independent. We count feeds from the same owner only once.

1
GitHub Status — incident history official service status · first detected Elevated rate of errors for OpenAI models provided by Copilot