Anthropic said it identified an issue resulting in elevated errors on Claude.ai across desktop and mobile, and is claude down showed around 3,000 Downdetector reports in the morning. Anthropic posted that users may experience errors when attempting to login, engaging with voice mode, or completing chats while the company works on a fix.
Anthropic Status Page Update
Anthropic wrote, "We have identified an issue resulting in elevated errors on Claude.ai, including desktop and mobile. Users may experience errors when attempting to login, engaging with voice mode, or completing chats with Claude. We are working to resolve this issue as soon as possible."
Downdetector Spikes to Around 3,000
Downdetector reports for Claude spiked to around 3,000 in the morning, later dropped and then jumped back up again, a pattern that accompanied reports describing intermittent disruption rather than a single uniform outage.
Claude Desktop App and Claude.code
A Downdetector user said, "Claude Desktop App (Mac) and Claude Code both down reporting 'API Error 401' since 9:45am Pacific Time" and Anthropic added, "This issue additionally affects login on other surfaces, such as Claude.code."
A supplementary source said elevated error rates on April 4 affected both Claude Opus 4.6 and Sonnet 4.6 across product surfaces, and the supplementary source also recorded incidents on April 1 and April 3 as well as a March surge where capacity limits caused repeated disruptions.
Downdetector report counts moved in the hundreds to thousands during the event, with the peak figure of around 3,000 indicating thousands of simultaneous user problem reports on public outage trackers and showing multiple product surfaces were reporting failures at the same time.
Anthropic acknowledged the problem on its status page and issued an update saying, "Update - We are continuing to work on a fix for this issue," which confirms the company is actively troubleshooting but provides no technical mitigation steps for affected users.
The verified public record shows Claude.ai posted 98.8% 90-day uptime before these incidents, and a supplementary source said 12+ day odds were elevated to 34%, placing this outage in the context of recent capacity and reliability concerns.
For users, confirmed, actionable facts are limited: logins, voice mode, and chat flows on both desktop and mobile may fail, and login attempts to Claude.code and the Claude Desktop App have been reported as returning "API Error 401" since 9:45am Pacific Time.
Anthropic has not provided a timeline for when the issue will be fixed.
