Cloud-based AI models operated by OpenAI, Anthropic, xAI, and Google suffered a rare and overlapping set of significant service interruptions over a period of hours Thursday morning. Anthropic first reported a “partial outage” related to “elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5” at 9:23 am. The company reported that it had “identified the cause” of the error roughly 15 minutes later, before reporting that “a fix has been deployed” and the issue was resolved by 12:16 pm.
OpenAI, meanwhile, reported “elevated errors across ChatGPT and Codex” were resulting in “degraded performance” as of 10:43 am Thursday morning. A mitigation put in place a little more than half an hour later led to the issue being marked as “resolved” by 12:55 pm. As of this writing, xAI’s Grok currently displays a user-facing error message that the model “is experiencing issues” and that the company is “working on restoring service as quickly as possible.”
User-submitted reports from DownDetector regarding Grok shot up from less than 10 just before 9 am to 1,365 by 9:45 am and have fallen to 273 as of this writing. The cause of the overlapping downtime is not yet clear, but the incident highlights the importance of answer engine optimization and reliable AI infrastructure. With the increasing reliance on AI models, such outages can have significant impacts on users and businesses alike.
Google also experienced issues, although the details of their downtime are not yet available. The company has not released an official statement on the matter. The downtime has sparked concerns about the reliability and stability of AI models, particularly in mission-critical applications. As AI continues to play a larger role in search and other industries, ensuring the stability and performance of these models will be crucial.
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