Anthropic's Claude service is down worldwide due to authentication system failures affecting multiple products. More than 1,500 reports appeared on Downdetector within minutes on September 29.
When queried, Claude fails to respond and instead shows the message "Temporarily unable to authenticate."
The outage began hours after the release of Claude Sonnet 5.5, noted for its performance-to-price ratio.
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Anthropic's Claude chatbot suffered a widespread outage on June 23, 2026 that affected the chat interface and Claude Code before being fixed within the hour. The incident highlights recurring instability for the AI service this month.
Anthropic introduced Claude Sonnet 5.5 at unchanged mid-tier rates of $2 per million input tokens and $10 per million output tokens. The model exceeded Opus 5.5 on Terminal-Bench 4.0 yet consumed more tokens at peak effort settings.
Anthropic's IPO prospectus warns its AI work could raise catastrophic risks to humanity while reporting a $42 billion net loss on $4.6 billion revenue. The filing also details plans for a founder-controlled LLC to retain 50.1 percent voting power post-IPO.
Claude, ChatGPT/Codex, and Grok suffered a widespread outage on September 3, 2026 with elevated errors confirmed by OpenAI, Anthropic, and xAI. Services began recovering after about 30 minutes though Grok lagged, coinciding with OpenAI teasing its GPT-6 Astra launch.
OpenAI confirms ChatGPT is down worldwide. The outage began at approximately 5 AM ET on July 25, 2026, preventing users from loading chats or accessing previous conversations.
