# Anthropic: Major incident: Elevated errors for Claude Fable 5.1

> Anthropic reported a major incident involving elevated errors for Claude Fable 5.1 across claude.ai, Claude API - api.anthropic.com, Claude Code and Claude Cowork, starting 2026-10-25 08:17 UTC. It remained open when archived (open for 0 min at the last update); Anthropic said it identified the caus

Canonical: https://rewindex.com/change/ib2458fe7a95d4f
Last updated: 2026-10-25T08:23:53Z

**Summary:** Anthropic reported a major incident involving elevated errors for Claude Fable 5.1 across claude.ai, Claude API - api.anthropic.com, Claude Code and Claude Cowork, starting 2026-10-25 08:17 UTC. It remained open when archived (open for 0 min at the last update); Anthropic said it identified the cause and was working on a fix, without detailing either. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-10-25 08:17 UTC · Detected: 2026-10-25 08:23 UTC
- [Source: https://status.claude.com/incidents/vx06kp8wfpq2](https://status.claude.com/incidents/vx06kp8wfpq2)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)
- Versions: before (none: first archived) → after incident\_version:1/vx06kp8wfpq2@ce8be5b2392a
- Change 1 of 3 for this incident

Incident page (full timeline): [Elevated errors for Claude Fable 5.1](https://rewindex.com/company/anthropic/incidents/vx06kp8wfpq2.md)
## What changed

**1. Added: Title**

```diff
+ Elevated errors for Claude Fable 5.1
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ identified
```

**4. Added: Start time**

```diff
+ 2026-10-25 08:17 UTC
```

**5. Added: Affected components**

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

**6. Added: Update** (investigating) · 2026-10-25 08:17 UTC

```diff
+ We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.
```

**7. Added: Update** (identified) · 2026-10-25 08:17 UTC

```diff
+ We have identified the cause of elevated errors on requests to Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-25 08:17 UTC | Major incident: Elevated errors for Claude Fable 5.1 (this change) | outage |
| 2026-10-25 08:34 UTC | [Incident updated: Elevated errors for Claude Fable 5.1](https://rewindex.com/change/r9b6668c94ae8e0.md) | Normal progress |
| 2026-10-25 08:54 UTC | [Incident updated: Elevated errors for Claude Fable 5.1](https://rewindex.com/change/r26d7d7e47e471e.md) | Normal progress |

Next: [change](https://rewindex.com/change/r9b6668c94ae8e0.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._


---
Canonical: https://rewindex.com/change/ib2458fe7a95d4f · Markdown: https://rewindex.com/change/ib2458fe7a95d4f.md · JSON: https://rewindex.com/api/v1/changes/ib2458fe7a95d4f · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T10:07:01.021Z