Outage in Anthropic
Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated error rates across Claude.ai (web, desktop, and mobile), Claude Code, Claude Cowork, and the Claude API for approximately one hour on September 29, 2026 (07:00–07:59 PT), with users reporting failed requests, conversation loading errors, and authentication issues including broken SSO and Sign in with Apple. A second wave of issues emerged after initial mitigation, blocking sign-ins, new chats, voice conversations, purchases, and file uploads, with some messages sent during the incident potentially lost. All services fully recovered by 07:59 PT and were confirmed stable thereafter.
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.
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Latest Updates ( sorted recent to last )
RESOLVED
about 15 hours ago - at 09/29/2026 04:27PM
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.
MONITORING
about 16 hours ago - at 09/29/2026 03:30PM
All services have been operating normally since 14:59 UTC. We are continuing to monitor.
MONITORING
about 16 hours ago - at 09/29/2026 03:11PM
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.
INVESTIGATING
about 16 hours ago - at 09/29/2026 03:00PM
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.
INVESTIGATING
about 16 hours ago - at 09/29/2026 02:41PM
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.
INVESTIGATING
about 17 hours ago - at 09/29/2026 02:30PM
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.
INVESTIGATING
about 17 hours ago - at 09/29/2026 02:28PM
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.
INVESTIGATING
about 17 hours ago - at 09/29/2026 02:21PM
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.
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