On September 3, 2026, Anthropic, a company known for developing advanced artificial intelligence models, confirmed that seven of its AI models were experiencing a series of errors. The most widely used of these models, called Claude, faced a significant outage, prompting the company to acknowledge the issue and promise a resolution. Users who rely on Claude for tasks such as work, coding, or casual conversation quickly noticed the disruption. Their concerns were reflected on Downdetector, a website that tracks service outages, where reports of the problem exceeded 500 in a short time. This level of user feedback suggests a major issue rather than a minor glitch. The affected models include both the latest and older versions of Anthropic’s AI systems. These models are named Mythos 5.1, Fable 5.1, Mythos 5, Fable 5, Opus 5, Opus 4.8, and Opus 4.6. This wide range of models means that users cannot easily switch to a backup system within the Claude ecosystem. The problem appears to be on Anthropic’s end, and users have limited options to resolve the issue themselves. Clearing caches, changing browsers, or restarting applications have proven ineffective. As a result, the responsibility for fixing the problem lies entirely with the company. Anthropic responded quickly to the incident, but its communication evolved as more details emerged. Initially, the company mentioned that it was investigating an increase in errors related to three specific models: Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. However, as the situation developed, it became clear that the outage involved seven models in total. The company stated that it had identified the cause of the error increase and was actively working to resolve the issue. While this is a positive step, Anthropic has not disclosed the technical details of the problem or the number of affected users or regions. At present, users are left waiting for further updates. No timeline for recovery has been provided, and the exact start time of the incident remains unspecified. To stay informed, users are advised to monitor Anthropic’s official status page, which centralizes the company’s communications, and Downdetector, which provides real-time insights into the service’s status based on user reports. Anthropic has committed to sharing new information as soon as it becomes available regarding the resolution of the outage.