Anthropic outage on April 28, 2026
Apr 28, 19:15 UTCResolved - This incident has been resolved.Apr 28, 18:59 UTCMonitoring - 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.Apr 28, 18:33 UTCUpdate - 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.Apr 28, 17:51 UTCIdentified - We have identified an issue resulting in elevated errors on the Anthropic API, as well as issues accessing Claude.ai, i
Deterministic readout · awaiting AI summary pass
Incident detected
Major confidence crossed the incident threshold for Claude.ai unavailable and elevated errors on the API.
Marked resolved
The incident was closed after 45 min of observed impact.
No per-source signal payloads were preserved in this incident's snapshot window.
Confidence scoring
80.00The incident reached 80.00 peak confidence across available stored status snapshots.
User reports
0 / 15mNo elevated user-report volume was preserved in the incident window snapshots.
Status samples
0 affectedThe incident row exists, but the bounded snapshot window does not include affected status samples.
Recovery signal
ResolvedRecovery was recorded at Tue, Apr 28, 2026, 08:00 PM UTC.
Anthropic users likely saw failed connections, degraded availability, or session instability for this AI Tools service. The incident reached Major severity and lasted 45 min. The stored report window does not show a preserved user-report spike.