# Anthropic: Major incident: Elevated errors for multiple models

**Summary:** Anthropic reported a major incident involving elevated errors on claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork. Started: 2026-08-24 05:06 UTC; resolved: 2026-08-24 08:30 UTC; duration: 3 h 24 min. The final update reported user errors from 04:50 UTC through 07:36 UTC, including requests to Claude Opus 5 and Fable 5. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-08-24 05:06 UTC · Detected: 2026-10-17 18:21 UTC
- [Source: https://stspg.io/5kzdprb1xsbx](https://stspg.io/5kzdprb1xsbx)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)
- Versions: before (none: first archived) → after incident\_version:1/vgz5psbjmt1h@b07cf59115bc
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Elevated errors for multiple models
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-08-24 05:06 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-08-24 08:30 UTC
```

**6. Added: Affected components**

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

**7. Added: Update** (investigating) · 2026-08-24 05:06 UTC

```diff
+ We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and Claude Opus 4.8. We will provide an update as soon as possible.
```

**8. Added: Update** (identified) · 2026-08-24 05:27 UTC

```diff
+ We have identified the cause of elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, and other Claude models and are working on a fix. We will provide an update as soon as possible.
```

**9. Added: Update** (identified) · 2026-08-24 06:42 UTC

```diff
+ We are continuing to work to resolve issues causing elevated requests on multiple models. We will provide an update as soon as possible.
```

**10. Added: Update** (identified) · 2026-08-24 07:47 UTC

```diff
+ At this time, we have seen errors stabilize on Opus 5 and Fable 5, and are working to fully resolve success rates on all affected models. We will provide an update as soon as possible.
```

**11. Added: Update** (resolved) · 2026-08-24 08:30 UTC

```diff
+ This issue has been resolved. From 9:50pm PT / 04:50 UTC through 00:36am PT / 07:36 UTC, users saw elevated errors on requests to Claude models, including Claude Opus 5 and Fable 5.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-08-24 05:06 UTC | Major incident: Elevated errors for multiple models (this change) | outage |

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/i8cf3694eb7a6ec · Markdown: https://rewindex.com/change/i8cf3694eb7a6ec.md · JSON: https://rewindex.com/api/v1/changes/i8cf3694eb7a6ec · Generated 2026-10-18T03:22:17.997Z