[2026-01-14] Incident Thread

[github-actions[bot]]

❗ An incident has been declared:

Copilot's GPT-5.1 model has degraded performance

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[github-actions[bot]]

Update

Copilot is experiencing degraded performance when using the GPT-5.1 model. We are investigating the issue.

[github-actions[bot]]

Update

We are continuing to investigate issues with the GPT-5.1 model with our model provider. Uses of other models are not impacted.

[github-actions[bot]]

Update

We are continuing to investigate issues with the GPT-5.1 model. We are also seeing an increase in failures for Copilot Code Reviews.

[github-actions[bot]]

Incident Resolved

This incident has been resolved.

[github-actions[bot]]

Incident Summary

On January 14th, 2026, between approximately 10:20 and 11:25 UTC, the Copilot service experienced a degradation of the Claude Opus 4.5 model due to an issue with our upstream provider. During this time period, users encountered a 4.5% error rate when using Claude Opus 4.5. No other models were impacted.

The issue was resolved by a mitigation put in place by our provider. GitHub is working with our provider to further improve the resiliency of the service to prevent similar incidents in the future.