AI's Black Thursday: ChatGPT, Claude, Gemini, and Grok all went down on the same day Whoa, September 3rd might just be the first true industry-wide outage day in the history of AI. ChatGPT, Claude, Gemini, and Grok all experienced widespread issues around the same time: frozen conversations, slower responses, error messages, login failures—even tools like Codex and Claude Code, which are already integrated into production workflows, were affected. OpenAI officially confirmed "elevated errors" for ChatGPT and Codex. Anthropic's issues were even broader, impacting Claude's web app, API, and Claude Code, with multiple models like Opus 5 and Opus 4.8 reporting errors. xAI also directly confirmed a Grok outage on their status page. Gemini's issues were relatively smaller in scale but still saw noticeable user complaints and some API anomalies. The weirdest part? All four companies had issues almost simultaneously, yet none of them have confirmed a shared root cause so far.