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GitHub outage on September 17, 2026: Elevated rate of errors for OpenAI models provided by Copilot

GitHub reported an incident affecting GitHub for 50 minutes on 17 September 2026, from 20:59 to 21:49 UTC.

github.com All times UTC

Resolved

Official incident reported by GitHub

Started
20:59
17 Sep 2026 UTC
Resolved
21:49
17 Sep 2026 UTC
Duration
50m
50 minutes
Impact
Minor
as rated by GitHub
Updates
3
posted by GitHub

Timeline

All times UTC.

Official incident from GitHub

Elevated rate of errors for OpenAI models provided by Copilot

Resolved Minor impact 17 Sep 2026 20:59 UTC View on GitHub's status page
  1. Official
    Investigating

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

  2. Official
    Monitoring

    We are experiencing degraded availability for GPT-5.6 Luna, GPT-5.6 Terra, GPT-5.6 Sol, GPT-6 Astra, GPT-5.3-Codex in Copilot products and IDE surfaces. This is due to an issue with an upstream model provider. The provider is working to mitigate the problem and we are monitoring recovery. We recommend choosing another model or selecting 'Auto' to continue using Copilot.

  3. Official
    Resolved

    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. 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.

"Official" rows are quoted from GitHub's public status page, www.githubstatus.com. Very long posts are shortened.

What our checkpoints saw

HostTracker's checkpoints, which test github.com from several locations, recorded no outage of 5 minutes or longer during this incident. A provider can report a problem that affects only some features, regions or accounts, which a check of the main address does not see. The live GitHub status shows what our checks see right now.

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Independent measurement by HostTracker. Not affiliated with GitHub. Official updates are quoted from GitHub's public status page and remain GitHub's own words.