Elevated latency and error rates for ChatGPT 5.5 Thinking

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.

Thu, May 21, 2026, 11:22 PM

(28 minutes ago)

Affected components

10:05 PM

11:22 PM

Updates

Resolved

All impacted services have now fully recovered.

Thu, May 21, 2026, 11:22 PM

Monitoring

We are continuing to monitor recovery.

Thu, May 21, 2026, 10:57 PM(25 minutes earlier)

Monitoring

We have applied the mitigation and are monitoring the recovery.

Thu, May 21, 2026, 10:25 PM(31 minutes earlier)

Identified

We have identified that users are experiencing elevated latency and error rates for ChatGPT 5.5 Thinking.

We are working on implementing a mitigation.

Thu, May 21, 2026, 10:05 PM(19 minutes earlier)