Incident with Copilot Availability
This summary is created by Generative AI and may differ from the actual content.
Overview
GitHub Copilot was degraded and most of its frontier chat models were temporarily unavailable across all regions between 03:35 UTC and 04:44 UTC on June 17, 2026.
Impact
The incident occurred during off-peak hours, which limited the number of customers affected. Customers could continue using GitHub Copilot by selecting one of the models that remained available.
Trigger
A configuration change that the production system deemed invalid triggered the incident.
Detection
The team started investigating after reports of degraded availability for Copilot.
Resolution
The incident was mitigated by reverting the configuration change, after which the affected models returned automatically as the service reloaded the previous configuration.
Root Cause
The root cause of the incident was a configuration change that the production system deemed invalid.