Outage in Anthropic
Elevated errors for Claude Sonnet 5.5 and other models
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated errors across multiple Claude models — including Mythos 5.1, Fable 5.1, Opus 5.5, Sonnet 5.5, and Haiku 5.5 — affecting both claude.ai and the API. The incident lasted approximately 30 minutes (23:05–23:35 PT on October 24, 2026), with the cause identified and a fix deployed within that window. Services were confirmed fully resolved shortly after.
We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.
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Latest Updates ( sorted recent to last )
RESOLVED
5 days ago - at 10/25/2026 07:53AM
The issue affecting Claude services has been resolved. Impact occurred from 23:05 PT on October 24 / 06:05 UTC on October 25 to 23:35 PT on October 24 / 06:35 UTC on October 25.
MONITORING
5 days ago - at 10/25/2026 06:35AM
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
IDENTIFIED
5 days ago - at 10/25/2026 06:27AM
We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.
INVESTIGATING
5 days ago - at 10/25/2026 06:14AM
We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.
Latest Anthropic outages
Elevated errors affecting the Gmail connector - 2 days ago
Elevated errors for Claude Sonnet 5.5 - 3 days ago
Elevated errors for Claude Sonnet 5.5 - 3 days ago
Elevated errors for Claude Fable 5.1 - 5 days ago
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