AI outage calendar – Claude (Anthropic)

Every incident published on official AI status pages, archived permanently — even after vendors remove them. Pick a month, click a day to see what broke.

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September 2026

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This month

13 official incidents this month · 10 days with major outages · times in UTC

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Major / criticalMinorOther / maintenanceSeen by our probesClick a day to see its incidents

Tue, Sep 29 1↑ Calendar

Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API

Claude (Anthropic) · Details · 14:21–16:27 · impact: major · lasted 2.1 h

Tue, Sep 22 1↑ Calendar

Elevated errors for multiple models

Claude (Anthropic) · Details · 00:57–02:35 · impact: major · lasted 1.6 h

Wed, Sep 16 1↑ Calendar

Issues with Google Play subscriptions

Claude (Anthropic) · Details · 16:18–16:51 · impact: none · lasted 33 min

Tue, Sep 15 1↑ Calendar

Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Claude (Anthropic) · Details · 09:48–11:14 · impact: major · lasted 1.4 h

Mon, Sep 14 1↑ Calendar

Degraded functionality for Claude Cowork on Windows

Claude (Anthropic) · Details · 09-10 15:54–19:14 · impact: major · lasted 4.1 d

Sun, Sep 13 1↑ Calendar

Degraded functionality for Claude Cowork on Windows

Claude (Anthropic) · Details · 09-10 15:54–09-14 19:14 · impact: major · lasted 4.1 d

Sat, Sep 12 1↑ Calendar

Degraded functionality for Claude Cowork on Windows

Claude (Anthropic) · Details · 09-10 15:54–09-14 19:14 · impact: major · lasted 4.1 d

Fri, Sep 11 2↑ Calendar

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Claude (Anthropic) · Details · 14:19–14:37 · impact: major · lasted 17 min

Degraded functionality for Claude Cowork on Windows

Claude (Anthropic) · Details · 09-10 15:54–09-14 19:14 · impact: major · lasted 4.1 d

Thu, Sep 10 2↑ Calendar

Elevated latency on the Claude API for some users

Claude (Anthropic) · Details · 21:43–23:24 · impact: minor · lasted 1.7 h

Degraded functionality for Claude Cowork on Windows

Claude (Anthropic) · Details · 15:54–09-14 19:14 · impact: major · lasted 4.1 d

Thu, Sep 3 2↑ Calendar

Elevated errors for multiple models

Claude (Anthropic) · Details · 13:26–16:23 · impact: major · lasted 3 h

Elevated errors for Claude Sonnet 5

Claude (Anthropic) · Details · 12:37–12:56 · impact: major · lasted 19 min

Wed, Sep 2 2↑ Calendar

Elevated errors for Claude Sonnet 5

Claude (Anthropic) · Details · 21:17–21:44 · impact: major · lasted 27 min

Delays in credit purchases

Claude (Anthropic) · Details · 09-01 23:26–01:24 · impact: minor · lasted 2 h

Tue, Sep 1 3↑ Calendar

Delays in credit purchases

Claude (Anthropic) · Details · 23:26–09-02 01:24 · impact: minor · lasted 2 h

Degraded performance on platform.claude.com and Claude for Microsoft Office 365

Claude (Anthropic) · Details · 17:05–18:07 · impact: minor · lasted 1 h

Degraded performance on Claude for Microsoft Office 365

Claude (Anthropic) · Details · 16:02–16:22 · impact: minor · lasted 20 min