According to Downdetector data, around 70% of complaints were related to Claude Chat, while 16% flagged issues with the mobile app and 14% with Claude Code. Several users also took to social media to report errors,

The app surged to the top free app on Apple's App Store after Anthropic clashed with the Department of Defense over limits for the technology.

Altman’s announcement came not long after President Trump “ordered” every federal agency to immediately stop using Anthropic's technology.

When Hegseth and Amodei met Tuesday, military officials warned that they could designate Anthropic as a supply chain risk, cancel its contract or invoke a Cold War-era law called the Defense Production Act to give the military more sweeping authority to use its products, even if the company doesn’t approve.

OpenAI secured a Pentagon deal, sparking backlash and shifting some users' loyalties to Anthropic's rival Claude chatbot.

The U.S. government's decision to grant a six-month transition period after blacklisting Anthropic suggests its Claude AI model was deeply embedded in Pentagon systems, according to investor Michael Burry.

Anthropic said its Claude AI system was experiencing errors early on Monday as users reported outages worldwide. There were "elevated errors" reported on Claude.ai, Console, and Claude Code. "A fix has been implemented and we are monitoring the results," Anthropic's Claude said on its status page.

That happened late on Saturday, February 28, and as of this writing, Claude is still holding the top spot. ChatGPT has slipped to second place, with

The Pentagon previously requested Anthropic, OpenAI, Google, and xAI allow the use of their AI models for “all lawful purposes,” to which Anthropic put up the most resistance over fears its AI models could be used for autonomous weapons systems and mass domestic surveillance.