EU - Some OpenAI models degraded in Copilot

Update timeline

1. investigating Mar 05, 2026, 12:47 AM UTC

   We are investigating reports of degraded performance for Copilot

2. investigating Mar 05, 2026, 12:53 AM UTC

   We are experiencing degraded availability for the gpt-5.3-codex model in Copilot Chat, VS Code and other Copilot products. This is due to an issue with an upstream model provider. We are working with them to resolve the issue.

3. investigating Mar 05, 2026, 01:13 AM UTC

   The issues with our upstream model provider have been resolved, and gpt-5.3-codex is once again available in Copilot Chat and across IDE integrations. We will continue monitoring to ensure stability, but mitigation is complete.

4. resolved Mar 05, 2026, 01:13 AM UTC

   On March 5th, 2026, between approximately 00:26 and 00:44 UTC, the Copilot service experienced a degradation of the GPT 3.5 Codex model due to an issue with our upstream provider. Users encountered elevated error rates when using GPT 3.5 Codex, impacting approximately 30% of requests. No other models were impacted. The issue was resolved by a mitigation put in place by our provider.