On Thursday morning, several major companies operating cloud-based artificial intelligence models experienced a rare and overlapping series of service disruptions. These companies include OpenAI, Anthropic, xAI, and Google, all of which provide AI tools used for tasks ranging from answering questions to writing code. The incidents began around 9:23 a.m. Eastern Time, when Anthropic, a company known for its AI chatbot Claude, reported a "partial outage" affecting specific versions of its models, including Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. The company identified the cause of the error within 15 minutes and deployed a fix, resolving the issue by 12:16 p.m. Shortly after noon, Anthropic reported another brief period of "elevated errors" on requests to its Claude Sonnet 5 model, though this issue appears to have been resolved quickly. OpenAI, the company behind the widely used ChatGPT and Codex AI tools, also reported disruptions. At 10:43 a.m., it noted "elevated errors across ChatGPT and Codex," which led to "degraded performance." A mitigation strategy was implemented about half an hour later, and the issue was marked as resolved by 12:55 p.m. Meanwhile, xAI, the company founded by Elon Musk and behind the Grok AI model, currently displays an error message to users indicating that the model is "experiencing issues" and that the company is "working on restoring service as quickly as possible." User reports of issues with xAI’s Grok surged dramatically on Thursday morning. According to DownDetector, a website that tracks service outages, reports about Grok increased from less than 10 just before 9 a.m. to 1,365 by 9:45 a.m. As of the latest update, the number of reports has dropped to 273, suggesting that the situation may be improving. These incidents, while brief, highlight the growing reliance on AI models and the potential for disruptions in their operation, even among leading tech companies.