Outage in OpenAI ChatGPT
Elevated latency and error rates for ChatGPT 5.5 Thinking
Resolved Minor
May 21, 2026 - Started about 7 hours ago
- Lasted about 1 hour
Incident Report
Summary AI Generated
ChatGPT 5.5 Thinking experienced elevated latency and error rates affecting both web and ChatGPT components for 1.3 hours. OpenAI identified the issue, implemented a mitigation, and monitored the recovery until service was restored.
We have identified that users are experiencing elevated latency and error rates for ChatGPT 5.5 Thinking.
We are working on implementing a mitigation.
Components affected
OpenAI ChatGPT Web OpenAI ChatGPT ChatGPTLatest Updates ( sorted recent to last )
MONITORING
about 7 hours ago - at 05/21/2026 10:57PM
We are continuing to monitor recovery.
MONITORING
about 7 hours ago - at 05/21/2026 10:25PM
We have applied the mitigation and are monitoring the recovery.
IDENTIFIED
about 7 hours ago - at 05/21/2026 10:05PM
We have identified that users are experiencing elevated latency and error rates for ChatGPT 5.5 Thinking.
We are working on implementing a mitigation.
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