Claude hit by outage as Anthropic confirms elevated error rates

On September 20, 2026, Claude users across web, mobile, and desktop encountered failed requests. Anthropic confirmed an active issue affecting Claude.ai, Claude Code, and Claude Cowork and said it is investigating, with no estimated fix time.

• Outage began shortly before 10 AM ET on September 20, 2026
• Down Detector showed over 2,900 reports by 10:04 AM ET
• Anthropic confirmed the issue at 10:21 AM ET and is investigating elevated error rates
• Claude.ai, Claude Code, and Claude Cowork are affected; no fix ETA given