Four major AI models suffer rare overlapping downtime
Over several hours Thursday morning, OpenAI (ChatGPT and Codex), Anthropic (Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5, and briefly Claude Sonnet 5), xAI (Grok), and Google all experienced significant, overlapping service interruptions affecting request errors or degraded performance.
Sep 3, 2026 ·Ars Technica













