OpenAI reports ChatGPT load failures and Enterprise SSO errors on 2026-06-18

Category: Outage
Status: developing
Sources: OpenAI status history
Summary: OpenAI's status history records two incidents on 2026-06-18. ChatGPT failing to load or save conversations began about 03:55 UTC and was later marked fully recovered. SSO login errors for some ChatGPT Enterprise workspaces began about 09:59 UTC; OpenAI reported it had applied a mitigation and was monitoring recovery at fetch time. No root cause was published.
Why it matters: The SSO failure blocks Enterprise-workspace users from authenticating, not just degrading chat, so affected teams lose access until the mitigation holds.
Follow-up: Confirm the Enterprise SSO incident fully resolved and watch for any OpenAI root-cause note.