Anthropic API outage on Oct 23, 2026

What happened

Anthropic API reported a major outage starting Oct 23, 2026, 23:37 UTC, affecting claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork. It was marked resolved at Oct 24, 2026, 00:11 UTC.

• The incident lasted 34m from first report to resolution.
• Anthropic API had reported 16 other partial or major outages in the 90 days before it.
• 7 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Anthropic API

The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.

Read Anthropic API's official incident report ↗

What our independent monitoring saw

Our independent monitoring of Anthropic API started after this incident, so this report is based on Anthropic API's status page.

Other outages around the same time

Significant incidents other vendors reported within 12 hours of this one.

• Partial outageZendeskOct 23, 2026, 15:20 UTC

  US-East degraded traffic

• Partial outageCloudflareOct 23, 2026, 15:47 UTC

  Network connectivity issues affecting services in North America

• Partial outageHostingerOct 23, 2026, 18:38 UTC

  Emergency Power Maintenance in BR-CAM Datacenter

• Partial outageAuth0Oct 23, 2026, 20:06 UTC

  Elevated Errors on Multiple Public Cloud Environments

• Major outageClaudeOct 23, 2026, 23:37 UTC

  Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5

• Partial outageAsanaOct 23, 2026, 23:57 UTC

  Background jobs partial outage

• Partial outageShippoOct 24, 2026, 06:53 UTC

  Royal Mail Storefeeder Service Degradation

Anthropic API's overall reliability

Full Anthropic API reliability report and live status → · Most reliable Anthropic API alternatives →