Major incident

Anthropic (Claude): Elevated errors for Claude Sonnet 5.5

Oct 27, 2026, 09:14 UTC

started

09:56 UTC

resolved

42 min

duration

Affected: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork

Current status of Anthropic (Claude): Operational — live Anthropic (Claude) status

Timeline

Oct 27, 2026, 09:14 UTC
investigating
We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.
Oct 27, 2026, 09:38 UTC
monitoring
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
Oct 27, 2026, 09:56 UTC
resolved
The issue affecting Claude services has been resolved.

Updates as published by Anthropic (Claude) (original).

This was part of a wider event: 119 services reported incidents within the hour.

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Akamai 09:58 UTC · Enterprise Application Access (EAA) Connector Issues
CM.com 09:57 UTC · Agent Inbox issue with logging in/loading conversations
Sangoma 09:53 UTC · Internet Service Impact - Carrier Event - AT&T and Verizon Wireless - Multiple States
Sage 09:19 UTC · Sage Intacct - Partial Outage
Moonshot AI 09:09 UTC · Kimi Code K3 TTFT 响应延迟升高
Channel.io 09:00 UTC · Issue detected with Channel Talk system
Twilio 09:00 UTC · Voice Call Failures From Twilio Phone Numbers to Germany
Twilio 08:37 UTC · Voice Call Failures from a Subset of Twilio Phone Numbers to Germany
Airwallex 08:22 UTC · Partial outage on FX conversion-quote service
PagBank 08:17 UTC · System unavailable: