On May 28th, 2026, between approximately 18:27 and 20:41 UTC, the GitHub Copilot service was degraded due to an issue with the Responses API of an upstream provider affecting the GPT-5.2, GPT-5.3-Codex, GPT-5.4, and GPT-5.5 models. Requests routed to these models via the Responses API returned elevated error rates, which also affected Copilot coding agent and Copilot code review. No other models were impacted.
We mitigated the incident by shifting traffic away from the affected models while the upstream provider deployed a fix.
GitHub is working to improve automated failover for the affected models and strengthen monitoring to prevent similar incidents in the future.
Posted May 28, 2026 - 20:41 UTC
Open AI models are currently unavailable. We are shifting requests to other models to reduce impact.
Posted May 28, 2026 - 20:06 UTC
We are investigating reports of degraded performance for Copilot
Posted May 28, 2026 - 19:20 UTC
This incident affected: Copilot.
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