Anthropic's Claude reportedly down for thousands of users on September 21

users took to social media and downdetector comments to note the outage, comparing it to problems with other services such as grok and speculating about causes ranging from water usage to internal fixes. anthropic confirmed it had identified the cause of the errors but did not disclose details or a timeline for restoration. the company suggested typical user‑side steps—refreshing the chat, clearing site data, using incognito mode, or disabling VPNs—though these are unlikely to resolve server‑side faults.