AI Giants Suffer Simultaneous Outages

San FranciscoFour AI services went down Thursday morning.

Users bought redundancy across providers that share the same cloud backbone.

OpenAI, Anthropic, xAI and Google are rivals that share cloud, CDN and routing infrastructure beneath their products.

Cloudflare and the major cloud providers reported no disruption, leaving the shared cause unidentified.

How each outlet framed it

drawn from 150+ reports worldwide

TheRegister.com: identifies technical causes: ChatGPT routing error (7:43am PT), Claude infrastructure issue (3-hour outage), Grok restoration
Ars Technica: specifies affected Claude models (Mythos 5.1, Fable 5.1, Opus 5, Sonnet 5); DownDetector reports spiked 10x in 45 minutes