Disruption with some Copilot services

What to do

• Check whether you use GitHub Copilot. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 1h 15m it lasted.

  Anything that failed between 2026-10-28 14:12 UTC and 2026-10-28 15:28 UTC may need a replay.

• Subscribe to GitHub's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=github works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Root cause

This is due to an issue with an upstream model provider.

Category: Upstream dependency

Updates from GitHub 8

1. investigatingOct 28, 2026, 2:12 PM UTC

   We are investigating reports of impacted performance for some GitHub services.

   provider

2. investigatingOct 28, 2026, 2:15 PM UTC

   We are experiencing issues with upstream model providers resulting in a degraded experience across Copilot services. The team is actively investigating the issue.

   provider

3. investigatingOct 28, 2026, 2:33 PM UTC

   We are experiencing degraded availability for the GPT-5.3-Codex, GPT-5.6 Luna, GPT-6.1 Sol, GPT-5.6 Terra, GPT-6 Luna, and MAI Code 1.1 Flash models in Copilot products and IDE surfaces. This is due to an issue with an upstream model provider. While we work with them to resolve the issue we recommend choosing another model to continue using Copilot.

   provider

4. investigatingOct 28, 2026, 2:55 PM UTC

   We are experiencing degraded availability for the GPT-5.3-Codex, GPT-5.6 Luna, GPT-6.1 Sol, GPT-5.6 Terra, GPT-6 Luna, and MAI Code 1.1 Flash models in Copilot products and IDE surfaces. We have identified the root cause and working to apply a mitigation. While we work to resolve the issue we recommend choosing another model to continue using Copilot.

   provider

5. investigatingOct 28, 2026, 3:15 PM UTC

   We have applied the mitigation and are seeing signs of recovery. We will continue to monitor and expect full resolution soon.

   provider

6. investigatingOct 28, 2026, 3:24 PM UTC

   Copilot is experiencing degraded performance. We are continuing to investigate.

   provider

7. monitoringOct 28, 2026, 3:26 PM UTC

   The degradation affecting Copilot has been mitigated. We are monitoring to ensure stability.

   provider

8. resolvedOct 28, 2026, 3:28 PM UTC

   On October 28, 2026, between 13:52 and 15:24 UTC, Copilot users saw errors when using several GPT-family models and the MAI Code 1.1 Flash model. Affected experiences included Copilot Chat in IDEs and on GitHub.com, the Copilot CLI, Copilot Code Review, the Copilot Coding Agent, Code Scanning Autofix, and Code Quality. About 9.73% of requests to the affected models failed, with a peak of about 36.97% at the start of the incident. The errors happened because a credential that we use to authenticate with an upstream model provider became invalid. We mitigated the incident by replacing the credential and redeploying the service. We are strengthening how we manage credentials for upstream providers to prevent this type of failure, returning retryable errors when an upstream provider rejects a request, and improving our monitoring so that we detect and mitigate this type of problem faster in the future.

   provider

Corrections

None so far.

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