Claude, the artificial intelligence chatbot developed by Anthropic, was down on Monday after a partial outage disrupted its app, desktop client and public application programming interface, triggering thousands of error reports from users and developers.
Downdetector, which tracks service disruptions through user submissions, showed a sharp rise in complaints from early morning UK time.
One snapshot during the disruption indicated that total reports had reached about 10,000, suggesting the outage unfolded in waves rather than as a single continuous failure.
Users described chat sessions failing to load, general access errors and application programming interface responses returning “500 errors”, indicating server-side failures rather than problems with individual devices or internet connections.
The desktop application also failed to open for some Windows users before a fix was deployed.
Anthropic acknowledged a partial outage on its status channel and said it had identified an issue affecting the desktop application and was working on a fix.
A deployment was rolled out for the desktop client, and the company advised users still experiencing problems to update to version v1.1.4328 or reinstall the application, while engineers continued to investigate recurring 500 errors affecting the public application programming interface.