Hour-long outage of Claude.ai, Claude Code, Claude Cowork and Claude API services
Anthropic reported approximately an hour of elevated error rates on Claude.ai, Claude Code, Claude Cowork and, to some extent, Claude API on 29. 9. 2026, including sign-in problems and a risk of unsaved messages. Service was restored around 14:59 UTC.
Anthropic reported elevated error rates across Claude.ai (including the desktop and mobile apps), Claude Code, Claude Cowork and, to some extent, Claude API starting at 14:00 UTC on 29 September 2026. Users experienced failing requests, errors when loading or sending conversations, and repeated prompts to sign in; according to the company, retrying a request could succeed.
The first intervention reduced error rates at approximately 14:36 UTC, but a second issue then emerged, preventing sign-in through SSO and Sign in with Apple, new conversations, voice conversations, Claude Code and Cowork sessions, purchases and file uploads. The company therefore advised users who were signed in not to sign out.
Most services were restored around 14:59 UTC, when the status changed to monitoring. The company warned that some messages sent between 14:00 and 14:59 UTC might not have been saved. The incident was formally closed at 16:27 UTC, with the company stating that services had been operating normally since restoration; the cause of the outage was not specified in the source.
Why it matters
The outage affected both individual users of the Claude product and companies that build automated or developer workflows on Claude Code, Cowork or API — for just under an hour, they could not work reliably, and some messages may have been lost. For operations that depend on these tools, this is a reminder of the risk of outages and the need to account for temporary unavailability or data loss during similar windows.
Two audiences, two different impacts
What this means
For individuals
Users of Claude.ai (web, mobile and desktop apps), Claude Code and Claude Cowork encountered errors when signing in, starting conversations, uploading files or making payments for approximately an hour, and had to retry requests or wait for service to be restored.
For a business
Companies using Claude Code, Claude Cowork or Claude API for automated or team workflows experienced a service interruption lasting just under an hour, including a possible risk that messages sent during that window were not saved.
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Event sources
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