Elevated error rates for GPT 5.5 in Codex

Updates timeline

1. Identified Jun 11, 08:59 PM UTC

   We have identified that users are experiencing elevated errors when using GPT 5.5 in Codex. We are working on implementing a mitigation.

2. Monitoring Jun 11, 09:33 PM UTC

   We have applied the mitigation and are monitoring the recovery.

3. Resolved Jun 11, 10:28 PM UTC

   All impacted services have now fully recovered.