Four major AI models suffer rare overlapping downtime
OpenAI, Anthropic, xAI, and Google AI services suffered rare overlapping outages on Thursday, with most incidents resolved within hours.
Anthropic reported a partial outage with elevated errors on Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 starting at 9:23 am ET, identifying the cause within about 15 minutes and resolving it by 12:16 pm, with a brief Claude Sonnet 5 error spike after noon. OpenAI reported elevated errors across ChatGPT and Codex from 10:43 am, marking the issue resolved at 12:55 pm after a mitigation. xAI's Grok showed a user-facing error message as DownDetector reports surged from fewer than 10 to 1,365 by 9:45 am, and Google also experienced interruptions during the same window.
- Anthropic outage affected Mythos 5.1, Fable 5.1, and Opus 5 from 9:23 am, fixed by 12:16 pm ET.
- OpenAI's ChatGPT and Codex showed elevated errors from 10:43 am, resolved at 12:55 pm.
- Grok DownDetector reports spiked from under 10 to 1,365 by 9:45 am before declining.
From the original article
1 min read at arstechnica.com
Service interruptions hit ChatGPT, Claude, Grok, and Gemini practically simultaneously.
By Kyle Orland · arstechnica.com
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