API users may see increased error rates for GPT-5.4 and GPT-5.5

Availability metrics are reported at an aggregate level across all tiers, models and error types. Individual customer availability may vary depending on their subscription tier as well as the specific model and API features in use.

Resolved·Degraded performance

All impacted services have now fully recovered.

Wed, May 20, 2026, 12:37 AM

(56 minutes ago)

Affected components

May 19, 2026, 10:30 PM

11:30 PM

Updates

Resolved

All impacted services have now fully recovered.

Wed, May 20, 2026, 12:37 AM

Monitoring

We have applied the mitigation and are monitoring the recovery.

Tue, May 19, 2026, 11:59 PM(38 minutes earlier)

Monitoring

We have applied the mitigation and are monitoring the recovery.

Tue, May 19, 2026, 11:38 PM(20 minutes earlier)

Identified

We have identified that users are experiencing elevated errors for the impacted services.

We are working on implementing a mitigation.

Tue, May 19, 2026, 11:32 PM