GitHub Copilot Degraded for 1 Hour 40 Minutes as Upstream API Hit 4 GPT Models
Updated
Updated · github.blog · Jun 11
GitHub Copilot Degraded for 1 Hour 40 Minutes as Upstream API Hit 4 GPT Models
1 articles · Updated · github.blog · Jun 11
Summary
May 28 from 18:27 to 20:41 UTC, GitHub Copilot suffered elevated error rates after an upstream provider’s Responses API issue hit GPT-5.2, GPT-5.3-Codex, GPT-5.4 and GPT-5.5.
Copilot coding agent and Copilot code review were also affected because requests routed through those models failed, while no other models were impacted.
GitHub mitigated the outage by shifting traffic away from the affected models as the upstream provider deployed a fix.
The incident capped a month with nine GitHub service degradations in May, as the company said it is expanding automated failover, monitoring and broader infrastructure resilience work.