Anthropic – Elevated error rate across multiple models
Anthropic reported an elevated error rate affecting multiple Claude AI models on June 4, 2025, with users in Brazil and other regions experiencing disruptions. The issue was identified around 08:11 UTC and later resolved. Downdetector recorded a significant spike in user reports during the outage.
Background
Anthropic is the San Francisco–based AI company behind the Claude family of large language models (Claude 3.5 Sonnet, Claude 3 Opus, etc.), which compete with OpenAI's GPT and Google's Gemini. The Downdetector page tracks real-time outages and error reports for Claude.ai, the company's chat interface, as well as the API that developers use to integrate Claude into their own apps. An "elevated error rate across multiple models" means that users are likely seeing error messages, failed requests, or slow responses from both the web chatbot and third-party services relying on the API — a significant event because many businesses and individual users depend on Claude for coding, writing, analysis, and automation. Such outages typically lead to a surge of user reports on Downdetector and social media.