Outage in Anthropic
Elevated error rates on Opus 4.6
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated error rates affecting Opus 4.6 and temporarily Sonnet 4.6, impacting claude.ai, console.anthropic.com, and api.anthropic.com for 9.8 hours. Sonnet 4.6 was restored to normal operation after 5 hours, while Opus 4.6 error rates were gradually reduced from severe levels to baseline over the incident duration. The issue was fully mitigated and resolved after implementing both temporary fixes and a permanent solution.
We are currently investigating this issue.
Need to monitor Anthropic outages?
- Monitor all your external dependencies in one place
- Get instant alerts when outages are detected
- Be the first to know if service is down
- Show real-time status on private or public status page
- Keep your team informed
Latest Updates ( sorted recent to last )
RESOLVED
2 days ago - at 03/27/2026 04:46PM
This incident has been mitigated as of 9:30 PT / 16:30 UTC.
MONITORING
2 days ago - at 03/27/2026 01:46PM
As of 6:40 PT / 13:40 UTC our error rate has returned to the baseline. We are still monitoring the current situation.
IDENTIFIED
2 days ago - at 03/27/2026 01:34PM
We have mitigated the main issue and the error rate for Opus 4.6 is hovering around 0.4% which is still high, but much better than the performance during the previous hours. We are waiting for a more permanent fix to land in the near future.
INVESTIGATING
2 days ago - at 03/27/2026 12:09PM
As of 5:00 PT / 12:00 UTC Sonnet 4.6 is now healthy. We are still working to fix Opus 4.6.
INVESTIGATING
2 days ago - at 03/27/2026 11:21AM
Sonnet 4.6 is also showing elevated errors.
INVESTIGATING
2 days ago - at 03/27/2026 11:04AM
We are continuing to investigate the ongoing incident.
INVESTIGATING
2 days ago - at 03/27/2026 06:59AM
We are currently investigating this issue.
Latest Anthropic outages
Dispatch sessions not responding in Claude Desktop - about 12 hours ago
Elevated errors on Opus 4.6 Fast Mode - 1 day ago
Elevated errors for MCP calls - 3 days ago
Elevated errors on Claude Opus 4.6 and Sonnet 4.6 - 3 days ago
Elevated errors on Claude Opus 4.6 - 4 days ago
The Status Page Aggregator with Early Outage Detection
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 · 6020 services available
Integrations with
