Degraded
ChatGPT outage on September 18, 2026: what happened and how long it lasted
On September 18, 2026, OpenAI / ChatGPT had degraded performance between 21:36 and 07:52 UTC, about 10.3 h in total. The vendor posted 3 incidents.
Timeline (UTC)
- OfficialOfficial incident posted: Delayed support responses
- OfficialOfficial incident posted: Overbilling for OpenAI-hosted containers in the Agent API
- OfficialOfficial incident posted: SSO sign-in and SCIM provisioning issues
- OfficialOfficially resolved: SSO sign-in and SCIM provisioning issues
- OfficialOfficially resolved: Delayed support responses
- OfficialOfficially resolved: Overbilling for OpenAI-hosted containers in the Agent API
Hourly measurements (UTC)
00:0012:0023:00
Was ChatGPT down on September 18, 2026?
On September 18, 2026, OpenAI / ChatGPT had degraded performance between 21:36 and 07:52 UTC, about 10.3 h in total. The vendor posted 3 incidents.
Is ChatGPT working now?
Live status: modelbank.ai/status/openai. We test it every 2 minutes.
How do I hear about the next outage first?
Subscribe for free on ModelBank: email, browser push, or Slack / Discord / Feishu.