# Elevated error rates on Opus 4.6

- Provider: [Anthropic](https://down.guide/anthropic)
- Level: confirmed
- Impact: Partial outage
- lasted 9h 47m
- started 2026-03-27 06:59 UTC
- claude.ai, Claude Console (platform.claude.com), Claude API (api.anthropic.com) +2
- id: DWN-9c9ce2719b
- Official page: https://stspg.io/zhtjpf6mjzct

## Updates from Anthropic
### 2026-03-27 06:59 UTC: investigating
We are currently investigating this issue.

### 2026-03-27 11:04 UTC: investigating
We are continuing to investigate the ongoing incident.

### 2026-03-27 11:21 UTC: investigating
Sonnet 4.6 is also showing elevated errors.

### 2026-03-27 12:09 UTC: investigating
As of 5:00 PT / 12:00 UTC Sonnet 4.6 is now healthy. We are still working to fix Opus 4.6.

### 2026-03-27 13:34 UTC: identified
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.

### 2026-03-27 13:46 UTC: monitoring
As of 6:40 PT / 13:40 UTC our error rate has returned to the baseline. We are still monitoring the current situation.

### 2026-03-27 16:46 UTC: resolved
This incident has been mitigated as of 9:30 PT / 16:30 UTC.

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