# Anthropic: Major incident: Elevated errors across many models

**Summary:** Anthropic reported a major incident with elevated errors across many models affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. It started at 2026-07-30 05:57 UTC and was resolved at 2026-07-30 10:48 UTC, lasting 4 h 51 min; models partially recovered before errors returned across all models. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-07-30 05:57 UTC · Detected: 2026-10-17 18:21 UTC
- [Source: https://stspg.io/cpzpstxn0z6k](https://stspg.io/cpzpstxn0z6k)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)
- Versions: before (none: first archived) → after incident\_version:1/fsh2zzzl2c4l@e045158fe963
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Elevated errors across many models
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-30 05:57 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-30 10:48 UTC
```

**6. Added: Affected components**

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

**7. Added: Update** (investigating) · 2026-07-30 05:57 UTC

```diff
+ We are currently investigating this issue.
```

**8. Added: Update** (identified) · 2026-07-30 06:26 UTC

```diff
+ All models except Opus 5 have recovered. We're working to recover Opus 5 as well.
```

**9. Added: Update** (identified) · 2026-07-30 07:33 UTC

```diff
+ As of 7:32 UTC / 0:32 PT, Opus 5 errors are back to baseline but we're seeing again Sonnet 5's errors up.
```

**10. Added: Update** (identified) · 2026-07-30 08:06 UTC

```diff
+ As of 8:05 UTC / 1:05 PT, Sonnet 5 errors are back to baseline, but we're seeing an increased error rate on Fable 5.
```

**11. Added: Update** (identified) · 2026-07-30 08:33 UTC

```diff
+ As of 01:33 PT / 08:33 UTC we are back to errors across all models.
```

**12. Added: Update** (monitoring) · 2026-07-30 10:03 UTC

```diff
+ As of 2:58 PT / 9:58 UTC the errors are back to baseline.
```

**13. Added: Update** (monitoring) · 2026-07-30 10:23 UTC

```diff
+ We are also investigating issues with Opus 4.7 and Opus 4.5.
```

**14. Added: Update** (resolved) · 2026-07-30 10:48 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-30 05:57 UTC | Major incident: Elevated errors across many 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._


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Canonical: https://rewindex.com/change/ib1fee952eafda0 · Markdown: https://rewindex.com/change/ib1fee952eafda0.md · JSON: https://rewindex.com/api/v1/changes/ib1fee952eafda0 · Generated 2026-10-18T00:37:40.841Z