Outage recap · Anthropic

Claude outage — October 28, 2026

On October 28, 2026, Claude had a reported incident on Anthropic's official status page. Below is what was reported — impact, timing, and the AI services the same upstream outage could affect.

Elevated errors affecting the Google Calendar connector

minor
Started
Oct 28, 12:19 PM EDT
Resolved
Oct 28, 4:05 PM EDT
Duration
3h 46m

Anthropic's updates (4)

  1. investigating · Oct 28, 12:19 PM EDT

    We are investigating elevated errors affecting the Google Calendar connector. Some requests to list or search calendar events have been failing since October 26. We will provide an update as soon as possible.

  2. investigating · Oct 28, 1:59 PM EDT

    We are continuing to investigate elevated errors affecting the Google Calendar connector, and are working with our upstream provider. We will provide another update as soon as we have more information.

  3. monitoring · Oct 28, 3:47 PM EDT

    We are seeing recovery for errors affecting the Google Calendar connector, and error rates have returned to normal levels. We are continuing to monitor with our upstream provider.

  4. resolved · Oct 28, 4:05 PM EDT

    The issue affecting the Google Calendar connector on claude.ai, Claude Code, and Claude Cowork has been resolved. Impact occurred from 04:07 PT / 11:07 UTC on October 26 to 11:52 PT / 18:52 UTC on October 28.

What our checks recorded

We checked Claude 45 times from Anthropic's start time to its resolution, once every five minutes. Every one of them reached Claude's site, so this incident did not show up as a failed page load. Our check loads the public site; it cannot see an API error or a broken feature. Median response time was 274 ms, against 287 ms over the 24 hours before. Anthropic posted the incident at Oct 28, 12:19 PM EDT.

Updates are Anthropic's own words from its status page (status: resolved); we never add an inferred cause. The vendor's incident page ↗

The AI cascade

Claude depends on Anthropic. When that upstream has an incident, it doesn't hit Claude alone — these AI tools share the dependency and can degrade at the same time:

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AIDownCheck is not affiliated with Anthropic. This recap summarizes incidents published on Anthropic's official status page.