Claude (Anthropic)
Outage

Claude outage on September 11, 2026: what happened and how long it lasted

On September 11, 2026, Claude (Anthropic) had an outage between 15:54 and 19:14 UTC, about 4.1 d in total. The vendor posted 2 incidents.

Live status

Timeline (UTC)

  1. OfficialOfficial incident posted: Degraded functionality for Claude Cowork on Windows
  2. OfficialOfficial incident posted: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
  3. OfficialOfficially resolved: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
  4. OfficialOfficially resolved: Degraded functionality for Claude Cowork on Windows

Hourly measurements (UTC)

00:0012:0023:00
Was Claude down on September 11, 2026?

On September 11, 2026, Claude (Anthropic) had an outage between 15:54 and 19:14 UTC, about 4.1 d in total. The vendor posted 2 incidents.

Is Claude working now?

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