# Anthropic: Major incident: Elevated errors for Claude Sonnet 5.5

> Major incident: Elevated errors for Claude Sonnet 5.5. Detected 2026-10-27 by Rewindex: what changed on Anthropic’s status page, with the before/after diff.

Canonical: https://rewindex.com/change/ic10ee9f1cee523
Last updated: 2026-10-27T15:13:56Z

**Summary:** _summary pending_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-10-27 15:09 UTC · Detected: 2026-10-27 15:13 UTC
- [Source: https://status.claude.com/incidents/lqhknfdjrcst](https://status.claude.com/incidents/lqhknfdjrcst)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)
- Versions: before (none: first archived) → after incident\_version:1/lqhknfdjrcst@a74346bd1dbb
- Change 1 of 2 for this incident

Incident page (full timeline): [Elevated errors for Claude Sonnet 5.5](https://rewindex.com/company/anthropic/incidents/lqhknfdjrcst.md)
## What changed

**1. Added: Title**

```diff
+ Elevated errors for Claude Sonnet 5.5
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ identified
```

**4. Added: Start time**

```diff
+ 2026-10-27 15:09 UTC
```

**5. Added: Affected components**

```diff
+ claude.ai, Claude API - api.anthropic.com, Claude Code, Claude Cowork
```

**6. Added: Update** (identified) · 2026-10-27 15:09 UTC

```diff
+ We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-27 15:09 UTC | Major incident: Elevated errors for Claude Sonnet 5.5 (this change) | outage |
| 2026-10-27 15:53 UTC | [Incident updated: Elevated errors for Claude Sonnet 5.5](https://rewindex.com/change/r0e8bddf0a5a0fb.md) | Normal progress |

Next: [change](https://rewindex.com/change/r0e8bddf0a5a0fb.md) · All Anthropic changes: [timeline](https://rewindex.com/company/anthropic/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._

## Cite this

Major incident: Elevated errors for Claude Sonnet 5.5 on Anthropic’s status page, changed 2026-10-27 15:09 UTC (change 1 of 2).

- Canonical URL: https://rewindex.com/change/ic10ee9f1cee523
- Citation: Anthropic, “Major incident: Elevated errors for Claude Sonnet 5.5” (2026-10-27 15:09 UTC). Archived by Rewindex: https://rewindex.com/change/ic10ee9f1cee523 (CC BY 4.0).
- Markdown link: `[Anthropic: Major incident: Elevated errors for Claude Sonnet 5.5 (2026-10-27)](https://rewindex.com/change/ic10ee9f1cee523)`


---
Canonical: https://rewindex.com/change/ic10ee9f1cee523 · Markdown: https://rewindex.com/change/ic10ee9f1cee523.md · JSON: https://rewindex.com/api/v1/changes/ic10ee9f1cee523 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T15:54:57.951Z