Resolved after 7 hours 42 minutes, affecting Anthropic, on March 27, 2026.
As of 6:40 PT / 13:40 UTC our error rate has returned to the baseline. We are still monitoring the current situation. https://status.claude.com/incidents/b9802k1zb5l2
Affected components
Update timeline
- investigating Mar 27, 2026, 09:37 AM UTC
We are aware of elevated errors with Claude Opus 4.6 and are monitoring the situation.
- investigating Mar 27, 2026, 09:48 AM UTC
We are aware of elevated errors with Claude Opus 4.6 and are monitoring the situation. https://status.claude.com/incidents/b9802k1zb5l2
- investigating Mar 27, 2026, 11:21 AM UTC
We are aware of elevated errors with Claude Opus 4.6 and are monitoring the situation. https://status.claude.com/incidents/b9802k1zb5l2
- investigating Mar 27, 2026, 11:24 AM UTC
Investigating We are aware of elevated errors with Claude Opus 4.6 and Claude Sonnet 4.6 and are monitoring the situation. https://status.claude.com/incidents/b9802k1zb5l2
- investigating Mar 27, 2026, 12:19 PM UTC
As of 5:00 PT / 12:00 UTC Sonnet 4.6 is now healthy. We are aware of elevated errors with Claude Opus 4.6 and are monitoring the situation. https://status.claude.com/incidents/b9802k1zb5l2
- identified Mar 27, 2026, 01:41 PM UTC
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. https://status.claude.com/incidents/b9802k1zb5l2
- monitoring Mar 27, 2026, 01:50 PM UTC
As of 6:40 PT / 13:40 UTC our error rate has returned to the baseline. We are still monitoring the current situation. https://status.claude.com/incidents/b9802k1zb5l2
- resolved Mar 27, 2026, 05:19 PM UTC
This issue has been resolved.
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