- Sources: incident, HN discussion
- Summary: Elevated error rates began at 14:00 UTC on 2026-09-29 across claude.ai, platform.claude.com, the Claude API, Claude Code, and Claude Cowork. The first issue was mitigated at 14:36 UTC, then a second issue blocked sign-in including single sign-on and Sign in with Apple, along with new chats, voice conversations, Claude Code and Cowork sessions, purchases, and file uploads. All services were operating normally from 14:59 UTC.
- Why it matters: Anthropic states some messages sent between 14:00 and 14:59 UTC may not have been saved, which is data loss rather than unavailability alone.
- Follow-up: Watch for a published root cause, which the incident page does not carry.
send feedback on this story