Claude AI users faced their second major disruption in three days on April 20, with access failures and error messages blocking the assistant, coding tools, and mobile applications. The incident began at 14:53 UTC (8:23 pm IST) and affected multiple platforms simultaneously.
Downdetector data showed complaints peaked with 6,500 users reporting issues accessing Claude Chat (36%), Claude Code (30%), and the mobile app (25%).
Users encountered messages including "Service is temporarily busy" and "Page not found" when attempting to use the web interface.
Anthropic officially acknowledged a "Partial Outage" on its status page, noting "Elevated errors on Claude.ai, API, Claude Code." The company's engineers identified authentication issues as the primary problem and began working on a fix within minutes of detection.
"The Claude API has fully recovered as of 8:01 PT / 16:01 UTC," the company stated.
By 15:20 UTC (9:50 pm IST), Anthropic reported that the API had fully recovered but access problems for the main interface persisted.
"We are currently working on mitigating the ongoing errors for Claude AI."
This marks the second significant incident in just three days, following a similar disruption earlier in April when both conversational and coding tools were rendered inoperational for a substantial period.
The repeated failures come as enterprise adoption accelerates, raising questions about infrastructure reliability under growing user loads.
"We have seen success rates for login to Claude.ai, including via Claude Code, stabilize and are working to fully resolve this issue."
Anthropic's latest update indicated progress. Restoration efforts continued through Sunday evening following the April 20 disruption.
