Claude outage: Elevated errors for Claude Sonnet 5.5

Affected components

• Claude API (api.anthropic.com)
• Claude Code
• Claude Cowork
• claude.ai

1. resolvedOct 27, 2026, 15:50 UTC

   The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 07:42 PT / 14:42 UTC to 08:17 PT / 15:17 UTC.

2. identifiedOct 27, 2026, 15:09 UTC

   We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

What APIStatus.watch saw

• Oct 27, 2026, 15:09 UTCoperational → degraded
• Oct 27, 2026, 15:54 UTCdegraded → operational

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• Cloudflare: ERR_TIMED_OUT and ERR_EMPTY_RESPONSE being observed by Cloudflare CustomersMajor · Oct 27, 2026, 12:28 UTC
• Sanity: API & API CDN timeouts for small subset of customersMajor · Oct 27, 2026, 14:33 UTC
• Akamai: Edge Delivery issues between Indonesia and SingaporeMinor · Oct 25, 2026, 13:44 UTC
• Linode: Connectivity Issue between ID-CGK (Jakarta) and SG-SIN-2 (Singapore 2)Minor · Oct 25, 2026, 13:54 UTC
• Cloudflare: Cloudflare Pages Upload IssueMinor · Oct 26, 2026, 00:00 UTC
• Twilio: Voice Call Failures from Twilio Phone Numbers to Digi Mobil RomaniaMinor · Oct 26, 2026, 13:09 UTC
• Twilio: SMS Delivery Delays and Failures from Twilio to Mauritel MauritaniaMinor · Oct 26, 2026, 14:20 UTC
• Twilio: MMS Delivery Delays and Failures from a Subset of Twilio Long Codes to Cellcom United StatesMinor · Oct 26, 2026, 20:29 UTC
• Twilio: SMS Delivery Delays from a Subset of Twilio Short Codes to Docomo Pacific United StatesMinor · Oct 26, 2026, 20:57 UTC
• Twilio: SMS Delivery Failures From a Subset of Twilio Phone Numbers to Multiple Networks in BrazilMinor · Oct 26, 2026, 23:55 UTC

How often does Claude have incidents?

Claude reported 45 incidents in the last 90 days, 26 of them major or critical. A typical incident lasted 1h 13m. See Claude's uptime and incident history