# Anthropic: Major incident: Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API

**Summary:** Anthropic reported major errors affecting claude.ai, Claude Code, Claude Cowork and the Claude API, blocking sign-ins, new sessions, purchases and uploads; some messages may not have been saved. Impact occurred from 14:00 UTC to 14:59 UTC; the incident started 2026-09-29 14:21 UTC and resolved at 2026-09-29 16:27 UTC (recorded duration: 2 h 5 min). _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-29 14:21 UTC · Detected: 2026-10-17 18:21 UTC
- [Source: https://stspg.io/br61xzj05pp5](https://stspg.io/br61xzj05pp5)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)
- Versions: before (none: first archived) → after incident\_version:1/4xvtc2gnq73l@5727f9460069
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-29 14:21 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-29 16:27 UTC
```

**6. Added: Affected components**

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

**7. Added: Update** (investigating) · 2026-09-29 14:21 UTC

```diff
+ We are investigating elevated error rates affecting Claude.ai (including the desktop and mobile apps), Claude Code and Claude Cowork. Users may see failed requests, errors loading or sending conversations, or be asked to sign in again; retrying may succeed. We will provide an update as soon as possible.
```

**8. Added: Update** (investigating) · 2026-09-29 14:28 UTC

```diff
+ We are investigating elevated error rates affecting Claude.ai (including the desktop and mobile apps), Claude Code and Claude Cowork. Some requests to the Claude API are also returning errors. We will provide an update as soon as possible.
```

**9. Added: Update** (investigating) · 2026-09-29 14:30 UTC

```diff
+ We are investigating reports of degraded performance affecting claude.ai, platform.claude.com, the Claude API, Claude Code, and Claude Cowork. We will provide an update as soon as possible.
```

**10. Added: Update** (investigating) · 2026-09-29 14:41 UTC

```diff
+ We have applied a mitigation and error rates have dropped substantially. Some sign-in attempts, account actions and Claude Code and Cowork sessions are still failing. We are continuing to work on a full fix.
```

**11. Added: Update** (investigating) · 2026-09-29 15:00 UTC

```diff
+ The errors that began at 14:00 UTC were mitigated at 14:36 UTC, and existing conversations are mostly working again. A second issue is preventing many users from signing in (single sign-on and Sign in with Apple are unavailable), starting new chats, voice conversations and Claude Code or Cowork sessions, making purchases, and uploading files. If you're signed in, please don't sign out. We're working on a fix and will post another update within 30 minutes.
```

**12. Added: Update** (monitoring) · 2026-09-29 15:11 UTC

```diff
+ Most services have recovered as of 14:59 UTC. Signing in, starting new chats, voice conversations, Claude Code and Cowork sessions, purchases and file uploads are working again. Some messages sent between 14:00 and 14:59 UTC may not have been saved. We are monitoring closely and will post another update within 30 minutes.
```

**13. Added: Update** (monitoring) · 2026-09-29 15:30 UTC

```diff
+ All services have been operating normally since 14:59 UTC. We are continuing to monitor.
```

**14. Added: Update** (resolved) · 2026-09-29 16:27 UTC

```diff
+ The issue affecting Claude.ai, the Claude desktop and mobile apps, Claude Code, Claude Cowork, and the Claude API has been resolved, and services have been operating normally since recovery. Impact occurred from 07:00 PT / 14:00 UTC to 07:59 PT / 14:59 UTC.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-29 14:21 UTC | Major incident: Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API (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/idc6fc8d75dae83 · Markdown: https://rewindex.com/change/idc6fc8d75dae83.md · JSON: https://rewindex.com/api/v1/changes/idc6fc8d75dae83 · Generated 2026-10-17T23:54:59.779Z