Outage in Anthropic
Claude.ai unavailable and elevated errors on the API
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced a major service outage that prevented users from accessing Claude.ai and caused elevated authentication errors on the API and console services. The incident affected all primary user-facing components including the main website, developer console, and API endpoints for 1.6 hours from 17:34–18:52 UTC on April 28th. The issue was identified as authentication-related problems and was fully resolved with all services returning to normal operation.
We are investigating an issue preventing users from reaching Claude.ai, and will provide an update as soon as possible.
Trusted by 1,000+ teams
Never miss outages in third-party dependencies
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the second something breaks.
Latest Updates ( sorted recent to last )
RESOLVED
1 day ago - at 04/28/2026 07:15PM
This incident has been resolved.
MONITORING
1 day ago - at 04/28/2026 06:59PM
We are seeing success rates across all services return to normal, and are monitoring closely to prevent any further issues. Impact occurred from 17:34–18:52 UTC.
IDENTIFIED
1 day ago - at 04/28/2026 06:33PM
We are continuing to work to resolve the issues preventing users from accessing Claude.ai, and causing elevated authentication errors for requests to the API and Claude Code.
IDENTIFIED
1 day ago - at 04/28/2026 05:51PM
We have identified an issue resulting in elevated errors on the Anthropic API, as well as issues accessing Claude.ai, including log-in paths for Claude Code. We are working to resolve these issues, and will provide an update as soon as possible.
INVESTIGATING
1 day ago - at 04/28/2026 05:41PM
We are investigating an issue preventing users from reaching Claude.ai, and will provide an update as soon as possible.
Latest Anthropic outages
Elevated errors on Claude Haiku 4.5 - about 7 hours ago
Elevated errors on Claude Opus 4.7 - about 22 hours ago
Elevated errors on Claude Sonnet 4.5 - 1 day ago
Elevated errors on Claude Haiku 4.5 - 1 day ago
Elevated billing related errors on Claude.ai - 2 days ago
Never miss outages in third-party dependencies
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
